Thursday, July 28, 2016

There is no limit

"Did it ever occur to you that there's no limit to how complicated things can get on account of one thing always leading to another?"

E.B. White. "Quo Vadimus?" The Adelphi Vol. 1 (new series)


Not long ago a good friend asked me about geography books for children. It's an interesting topic. And I think I can say, at the risk of seeming immodest, that this is  a topic for which I am completely unprepared.

But that doesn't mean I won't try.

First things first: Just what do you mean by "geography"?

It's a tricky question. The problem is, geography is a sort of ... deep discipline. All disciplines (all fields of study) get complicated the more you look at them. History isn't just "when." It's also "who" and "why" and "where," and so much more. It's biology and economics and weather and art and psychology. Biology isn't just living things. It's energy and chemistry and plate tectonics and anthropology. Poetry, dance, painting -- they're math and neuroscience and climatology. And more. Always, always more. The deeper you look, the more interconnected and complicated everything gets.

And no discipline is more interconnected and complicated than geography. Mona Domosh put it rather well: "We are a promiscuous discipline."1 Geography overlaps with everything. On the physical science side we have biogeography, meteorology, geomorphology. On the social science side we have demographics, historical geography, economic geography. At the nexus of art and science we have graphic visualization and map making.

Which sort of makes it seem like when somebody asks you for a book about geography, you can literally give them anything. Because it's all "geography," when you think about it.

Which isn't helpful.

And it's also not quite true. Because the underlying fundamental focus of geography is space. Or, as the late George Demko put it, "The why of where."2 This unifying idea -- that location is crucial in understanding the world around us -- lets us sift through the clutter.

So, let's get back to the original question about geography books for children. As I said before, I like to think of myself as uniquely unqualified to answer this question. But that's all right. Exploration of unfamiliar territory is a geographic tradition. Let's think about this.

If I'm going someplace new, I buy a guidebook. If I'm looking for information on books, I go to the booksellers.

Let's start with the biggest of them all, Amazon.

Amazon sells everything from AA batteries to Ziploc™ bags, but they started with books, and they're still the largest bookseller in the world. And anybody who's ever been to the website knows that keyword choice is critical. I tried several different but similar search terms. Or maybe not so similar. Because the differences in the results were ... interesting:

  • "Children's books geography" (All Departments): 22,108 results
  • "Children's books geography" (Books): 19,198 results
  • Within "Books" there are 37 categories, some highly relevant, some noticeably less so:
    1. Children's Geography & Cultures Books (5,848)
    2. Human Geography (434)
    3. Beginner Readers (379)
    4. Geography (1,519)
    5. Regional Geography (438)
    6. Earth Science for Teens & Young Adults (545)
    7. Teen & Young Adult Geography (206)
    8. Science & Technology for Teens (707)
    9. Rivers (109)
    10. Schools & Teaching (2,838)
    11. Children's Books (15,326)
    12. Science & Math (3,025)
    13. Teen & Young Adult (2,575)
    14. Arts & Photography (144)
    15. Biographies & Memoirs (197)
    16. Business & Money (229)
    17. Christian Books & Bibles (87)
    18. Computers & Technology (694)
    19. Cookbooks, Food & Wine (29)
    20. Crafts, Hobbies & Home (48)
    21. Education & Teaching (3,042)
    22. Engineering & Transportation (329)
    23. Health, Fitness & Dieting (106)
    24. History (1,834)
    25. Humor & Entertainment (100)
    26. Law (30)
    27. Literature & Fiction (258)
    28. Medical Books (99)
    29. Parenting & Relationships (62)
    30. Politics & Social Sciences (1,044)
    31. Reference (10,071)
    32. Religion & Spirituality (151)
    33. Science Fiction & Fantasy (20)
    34. Self-Help (26)
    35. Sports & Outdoors (134)
    36. Test Preparation (89)
    37. Travel (946)
  • As an alternative, let's try "Geography books for kids" (Books): 1,068 results. Within this general result there are 27 categories:
    1. Teen & Young Adult (41)
    2. Children's History (81)
    3. Children's American Historical Fiction (5)
    4. Science & Math (239)
    5. Education & Teaching (151)
    6. Travel (97)
    7. Computers & Technology (15)
    8. Arts & Photography (24)
    9. Biographies & Memoirs (13)
    10. Business & Money (10)
    11. Christian Books & Bibles (11)
    12. Comics & Graphic Novels (2)
    13. Cookbooks, Food & Wine (9)
    14. Crafts, Hobbies & Home (15)
    15. Engineering & Transportation (24)
    16. Health, Fitness & Dieting (10)
    17. History (97)
    18. Humor & Entertainment (28)
    19. Law (1)
    20. Literature & Fiction (18)
    21. Medical Books (7)
    22. Parenting & Relationships (9)
    23. Politics & Social Sciences (67)
    24. Religion & Spirituality (19)
    25. Self-Help (2)
    26. Sports & Outdoors (35)
    27. Test Preparation (20)
You'll notice that the lists aren't identical. And a look at the books shows that some of these are distinctly weird choices for "geography."

For example, the "Law" category in the second listing (number 19) has exactly one book: "The Everything Wills & Estate Planning Book: Professional advice to safeguard your assests and provide security" by Deborah S Layton. No doubt a delightful a read, but how on earth is this geography? Or for children?

Another example. In the "Teen & Young Adult Geography" category in the first listing (number 7) the first half dozen "most relevant" titles are:

  1. "1st Grade Geography: Continents of the World: First Grade Books" by Baby Professor
  2. "Maps, the Oceans & Continents : Third Grade Geography Series: 3rd Grade Books" by Baby Professor
  3. "Sixth Grade Daily Geography: Simple Geography Lessons: Wonders Of The World for Kids" by Baby Professor
  4. "The Five Elements First Grade Geography Series: 1st Grade Books" by Baby Professor
  5. "Weather We Like It or Not!: Cool Games to Play on A Cloudy Day: Weather for Kids" by Baby Professor
  6. "Discovering the World of Geography, Grades 7 - 8" by Myrl Shireman

These are definitely geography books. But, with the exception of number 6, they are certainly not suitable for teens or young adults.3

I'm not going to try and go through all of these listings. I'm sure you get the point. Amazon has everything. And all too often they mix the diamonds in with the muck and it's up to you to figure out if what you want is there.

A slightly more targeted approach might be to choose a choosier site. Goodreads is, according to their website, "the world’s largest site for readers and book recommendations. Our mission is to help people find and share books they love." Rather than being forced to search yourself, here you can find books that other people actually think are relevant.

The search "Geography for Children" produced eight groupings:

  1. Educational Children's Fiction Books (205 books — 104 voters)
  2. Read Around the World (89 books — 61 voters)
  3. Microhistories For Juveniles – Social Histories of Things, Events and People (51 books — 28 voters)
  4. Picture Books On Africa (120 books — 14 voters)
  5. Black and African American Contemporary Picture Books (224 books — 13 voters)
  6. Northwest Children's Authors (32 books — 12 voters)
  7. Picture Books About Traveling (74 books — 2 voters)
  8. Picture Books About Maps & Geography (49 books — 1 voter)

These certainly seem like a good place to start -- but again, surprisingly enough, the selections are just a little bit odd. For example, in the first category, "Educational Children's Fiction Books," the first six books are:

  1. Punctuation Takes a Vacation by Robin Pulver 
  2. Grapes Of Math by Greg Tang 
  3. Zero the Hero by Joan Holub 
  4. Who Pooped in Central Park?: Scat and Tracks for Kids by Gary D. Robson 
  5. Math Curse by Jon Scieszka 
  6. Rotten Pumpkin: A Rotten Tale in 15 Voices by David M. Schwartz

It's true, I haven't read any of these, but I'll bet you a nickle that not one is, by any reasonable definition, about geography.

I'm going to stop here for now. There are lots of other booksellers and recommendation sites to check -- Powell's Books, Barnes and Noble, Waterstones (UK), Booknixie, etc. But my results so far are not especially encouraging.

Anybody who is looking for an easy source of suggestions for geography books for children is going to have to do some digging. Which is kind of annoying. But then again, serendipity is a valid way to find good books. Sometimes it's the only way.


1 Domosh, Mona. 2014. "Strategic Essentialism and Radical Intra-Disciplinarity." President's Column, July 15, 2014. American Association of Geographers. Online: http://news.aag.org/2014/07/strategic-essentialism-and-radical-intra-disciplinarity/

2 Demko, George J., Jerome Agel and Eugene Boe. 1992. Why in the World: Adventures in Geography. New York: Anchor Books.

3 We defined "geography." We didn't define "child." I'm not sure anybody can define "child." But it should be pretty obvious that five year olds and ten year olds and sixteen year olds have different needs, and really can't use the same books. That's probably a topic for another posting.







Wednesday, July 20, 2016

Flames Will Consume

The Trojan fleet is ready, equipped with arms and men; soon oar and breeze will make swift our way. Like a great queen you will make your progress through the Dardanian towns, and the common crowd will think a new goddess come to earth; wherever you advance your steps, flames will consume the cinnamon, and the slain victim will strike the bloody earth.

Ovid (Publius Ovidius Naso) (43 BCE - 18 CE). Heroides, Letter XVI (Paris to Helen). Translated by Grant Showerman. Loeb Classical Library Volume 41. Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1931. Online: http://www.theoi.com/Text/OvidHeroides1.html .


Figure 1: Cover of the Sears "Grocery Catalog" for 1915




Nobody actually needs cinnamon. Nobody needs cloves. Nobody needs nutmeg or allspice or cardamom or black pepper or saffron or cumin or ginger or any other spice:
"One might live a a perfectly healthy life without ever ingesting, inhaling or otherwise being exposed to any one of the desiccated bits of vegetation that have traditionally been considered spices" (Keay 2006, p. xii).
And yet we've been using spices (and herbs) for literally thousands of years. There's evidence of people using black pepper (Piper spp.) in Thailand as early as 9,000 years ago (see Gorman 1971; Solheim 1972), and using garlic mustard (Alliaria petiolata) in Europe 7,000 years ago (see Saul et al. 2013). Cloves (Syzygium aromaticum) have been found in what is now Iraq dating back to 1721 BCE (Turner 2004, p. xv). Black peppercorns (Piper nigrum) were found stuffed up the nose of the Pharaoh Rameses II (1303-1213 BCE; they were used as part of funerary rites), and the Emperor Justinian (482-565 CE) was embalmed with spices (see Turner 2004, p. 145).

Necessary or not, we crave our spices. We've historically used spices in four ways:
  • Religion
  • Medicine
  • Preservation
  • Pleasure
Some spices and herbs are still used religiously. Turmeric is used in Hindu and Buddhist rituals (Foster 2016), and cinnamon, cloves and other "sweet-smelling spices" are part of the Jewish ritual of havdalah (Sherwin Miller Museum of Jewish Art 2016).

The medicinal qualities of spices are highly disputed, but there is some evidence that cinnamon may have anti-cancer (Long et al. 2015) and anti-oxidant properties (Skulas-Ray 2011), fenugreek may help ease cold symptoms (Cedars Sinai Medical Center 1999) and diabetes (Griffith University 2007), and turmeric may prevent liver damage (Baghdasaryan et al. 2010).

The idea that spices can be used as a preservative is actually fairly contentious. It's commonly stated, for example, that in the Middle Ages Europeans used spices to disguise the flavor of rotting meat. This is tremendously unlikely:
"Spices ... of themselves ... have very few preservative properties...experimentation suggests that far from disguising the disgusting, spices may...actually exaggerate it" (Keay 2006, pp. 27-28).

"Anyone willing to believe that medieval Europeans lived on a diet of spiced and rancid meat has never tried to cover the taste of advanced decomposition with spices" (Turner 2004, p. 109).
On the other hand, in the same book Turner states that ancient Egyptian embalmers used spices because they were effective at "slowing or killing the bacteria that cause decomposition" (2004, p. 147), and that "it was not until the nineteenth century, with the development of formaldehyde and the improvement of techniques of arterial embalming" that the use of spices in European burials ended (204, p. 308). It seems this is a question that definitely has not been settled.

At last we come to pleasure. Spices make us happy. They "transform boring food" (Keay 2006 p. 27). In the middle ages spices "were a signpost of ... class ... spices meant nobility" (Turner 2004, pp. 132-133). Spices were quite literally "status symbols" (Keay 2006, p. 251), and the "value [of spices] ... depended not on need but on desire, and ... the human obsession with social prestige" (Keay 2006, p. 31).

We may not need spices, but we want them. We are willing to pay for them. And at times we've paid a lot for spices.

A lot.

According to Pliny the Elder (23-79 CE), the Roman Empire spent a great deal of its wealth on foreign goods, including spices: "in no year does India drain our empire of less than five hundred and fifty millions of sesterces"1 (The Natural History 6:26). Pliny might complain, but for the last few thousand years most wealthy people would have considered that quite reasonable: "During the heyday of the pepper trade the spice was more valuable than gold and silver" (Shaffer 2013, p. 26), and "exotic and expensive luxuries were, after piety and war, the chief expenses of the aristocracy" (Turner 2004, p. 95). .

Starting in the 1500s European powers began trading in spices from South and Southeast Asia, accumulating insane profits. How insane?
"In the Banda Islands ten pounds of nutmeg cost less than one English penny. In London, that same spice cost more than £2.10s -- a mark-up of a staggering 60,000 percent" (Milton 1999, p. 6)2

"[Nutmeg] sold in Amsterdam at around 12,000 percent of the price paid in Banda" (Keay 2006, p. 245)

"Throughout the seventeenth century the markup on cloves and nutmeg between purchase and final sale was on the order of 2000%" (Turner 2004, p. 291)

"American pepper traders from Salem, Massachusetts [in the early 1800s] ... made a net profit of 700 percent" (Shaffer 2013, p. 28).
Even Vasco da Gama, on the very first European voyage to India in 1498, made a profit of 3,000% on spices, despite losing half his men and one third of his fleet (see Halsall 1998).

To keep prices high no effort was too great, or too horrible. The Dutch, the English, as well as the French, Spanish, Portuguese and the Americans (who came quite late to the table), engaged in war, piracy, slaughter and slavery:
"By the 1620s the [Dutch East Indian Company] had worked to death or expelled practically the entire population of the Bandas. The company imported slaves to work the plantations..." (Turner 2004, p. 290)3

"Atrocities would be freely committed, wars fitfully fought, states toppled, peoples uprooted, hundreds of ships lost, thousands of lives squandered -- and all for limited quantities of various desiccated barks, shriveled berries, knobbly roots, dead buds, crumpled membranes, sticky gums and old fruit stones, none of them exactly indispensable and most of them quite irrelevant to the generality of mankind" (Keay 2006, pp. 5-6)
Of course, as with any commodity, prices are going to be determined at least partly by what the market will bear. Too high, and you limit the number of people who can buy your product. Also, "prices had to be held below the levels at which sensational profits might be realised [sic] in order to discourage other importers" (Keay 2006, p. 250).

So how much did spices cost?

The late Dr. John Munro (1938-2013) of the University of Toronto had an interest in understanding the economics of the Middle Ages. In 1983 Professor John Munro of the University of Toronto gave a lecture, "The Luxury Trades of the Silk Road: How Much Did Silks and Spices Really Cost?" which was delivered to the Royal Ontario Museum Continuing Education Symposium "Silk Roads, China Ships." In 1988 Dr. Munro revised his lecture and titled it "Oriental Spices and Their Costs in Medieval Cuisine: Luxuries or Necessities?" This lecture was delivered to the Canadian Perspectives Committee, Senior Alumni Association, University of Toronto, at University College. The lecture was further revised in 2001. An online version is available at https://www.economics.utoronto.ca/wwwfiles/archives/munro5/SPICES1.htm, and the data I'm presenting here is taken from that source.4

Dr. Munro was interested in comparing the price of spices in the past and present. In a sense that's fairly simple -- find the documents and see what people paid. Unfortunately that doesn't usually work very well:
"Relative values are very hard to express: relative to what? We rejected the idea of expressing these prices in terms of grams of gold, because the purchasing power of gold has so radically changed over time, as indeed has its value in terms of just silver (9:1 in 1350; 16:1 in 1750; 65:1 today). Expressing values in terms of wheat equally ludicrous; but the labour [sic] of a skilled building craftsmen offers a measure of value with greater historical consistency and continuity -- has meaning." (Munro 2001: https://www.economics.utoronto.ca/wwwfiles/archives/munro5/SPICES1.htm)

So  -- how much do spices cost? How have prices changed over the last six or seven centuries? Dr. Munro did several very detailed analyses, but this is a representative sample:


SpicesLondon, 1348
(workdays/lb)
Toronto 2001
(workdays/lb)
Data from Munro 2001
(https://www.economics.utoronto.ca/wwwfiles/archives/munro5/SPICES1.htm)
Cloves4.44.017 (25.48 min)
Cinnamon3.02.014 (19.94 min)
Ginger 1.50.012 (16.95 min)
Black Pepper2.25.017 (25.28 min)
Saffron22.862.6 (3,759.05 min)

Table 1: Days of labor needed to buy spices, 1348 vs. 2001.


Dr. Munro took the average wage of a skilled worker in 1348 and determined how many days it would take to earn enough money to buy various spices. He then took the average wage in 2001 in Toronto, Canada and determined how many minutes work it would take to buy various spices (to make comparison simpler I converted the minutes to days).

I'm not even going to try to graph this. To put it simply -- spices were really expensive in the 14th century. Demand was high, supply was largely controlled by monopolies and restricted. Transportation was slow and dangerous. So it makes sense that spices centuries ago were a lot higher.

But is that always true?

I recently came across an online copy of the Sears, Roebuck and Company grocery catalog, "Your Grocery Store," for 1915 (Online: http://www.authentichistory.com/1898-1913/3-consume-leisure/6-Consumerism/1915_Sears_Grocery/index.html ; see the illustration at the beginning of this post). I wondered how the price for spices then compared with today's prices.

Below is a table showing the prices for spices (both ground and whole spices) listed in the 1915 Sears grocery catalog:

Spices$ (ground)
Sears 1915
(all 1/2 lb)
$ (whole)
Sears 1915
(all 1/2 lb)
Black pepper0.140.10
Cayenne0.17--
White pepper0.180.15
Cinnamon "Extra"0.240.16
Cinnamon "Select"0.210.09
Ginger0.210.13
Allspice0.100.06
Cloves0.230.22
Mustard0.160.14
Nutmeg0.180.17
Mace0.420.29

Table 2: Prices, Sears 1915 (ground and whole spices).


The next question: What can I use for a comparison?

Sears was the largest mail-order retailer in the world a century ago. Today the largest online retailer in the world is Amazon.5 And Amazon sells spices. Below is a table for the same spices listed above:


Spices$ (ground)
Amazon 2016
$ (whole)
Amazon 2016
Black pepper19.95 (16 oz)14.49 (13 oz)
Cayenne8.18 (14 oz)--
White pepper20.90 (18 oz)18.95  (16 oz)
Cinnamon "Extra"9.82 (18 oz)10.31 (8 oz)
Cinnamon "Select"11.20 (18 oz)19.00 (8 oz)
Ginger16.69  (16 oz)7.99  (16 oz)
Allspice23.40  (16 oz)10.91  (16 oz)
Cloves28.31 (16 oz)14.74  (16 oz)
Mustard26.99  (16 oz)27.99 (22 oz)
Nutmeg17.41 (16 oz)32.95  (16 oz)
Mace59.99 (15 oz)38.99 (4 oz)

Table 3: Prices, Amazon 2016 (ground and whole spices).


Making a comparison between the two is a little complicated:
  • All of the spices sold by Sears in 1915 were in 1/2 pound (0.227 kilogram) quantities. The Amazon spices were sometimes sold in one pound (0.45 kilogram) quantities, sometimes in other quantities (as indicated).
  • All of the spices sold by Sears in 1915 were their own store brand, "Montclair." For current spices I tried, whenever possible, to use McCormick spices. McCormick and Company is the largest seller of spices in the world today. Unfortunately, it was not always possible to use McCormick spices; frequently Amazon only sold small containers of spices (so that the per-pound cost was inflated), or larger quantities were out of stock. When this happened I chose a different spice producer that sold the spice in a reasonably sized quantity. A list of the non-McCormick spices can be found in the Notes below.6
  • The value of a dollar in 2016 is considerably less than it was in 1915.
None of these difficulties is insurmountable.

Let's begin with the problem of price per pound. The simplest solution: convert all values to price per kilogram. Here is a combined table including all of the Sears 1915 and Amazon 2016 spices:

Spices$/kg (ground)
Sears 1915
$/kg (whole)
Sears 1915
$/kg (ground)
Amazon 2016
$/kg (whole)
Amazon 2016
Black pepper0.620.4443.9839.29
Cayenne0.75--20.56--
White pepper0.790.6641.0141.78
Cinnamon "Extra"1.060.7119.2745.46
Cinnamon "Select"0.930.408.8783.77
Ginger0.930.5736.7917.61
Allspice0.440.2651.5924.05
Cloves1.010.9762.4132.50
Mustard0.710.6259.5045.05
Nutmeg0.790.7538.3872.64
Mace1.852.56141.51343.83

Table 4: Prices, Sears 1915 and Amazon 2016.


The next issue: The value of a dollar. The Bureau of Labor Statistics has an online "Inflation Calculator" that gives an estimate of the value of the dollar over time, from 1913 to the present (http://www.bls.gov/data/inflation_calculator.htm ). According to the Calculator, $1.00 in 1913 is equivalent to $24.35 in 2016.7 Converting the 1915 prices to 2016 values gives us Table 5:

Spices $/kg (ground)
Sears
$ Converted 2016
$/kg (whole)
Sears
$ Converted 2016
$/kg (ground)
Amazon
2016
$/kg (whole)
Amazon
2016
Black pepper15.0310.7443.9839.29
Cayenne18.25--20.56--
White pepper19.3316.1141.0141.78
Cinnamon "Extra"25.7717.1819.2745.46
Cinnamon "Select"22.559.668.8783.77
Ginger22.5513.9636.7917.61
Allspice10.746.4451.5924.05
Cloves24.6923.6262.4132.50
Mustard17.1815.0359.5045.05
Nutmeg19.3318.2538.3872.64
Mace45.0962.27141.51343.83

Table 5: Prices per kilogram, in 2016 dollars, Sears 1915 and Amazon 2016.


It's obvious that there are major differences between 1915 and 2016. Let's visualize them:

Figure 2: Comparison -- 1915 vs. 2016 prices
(ground spices in 2016 dollars)


With the exception of cinnamon (both "Extra," which was more expensive and presumably a higher grade, and "Select"), every spice is more expensive today.

Perhaps that's to be expected. Global population in 1915 was less than 2 billion people; today it's about 7.4 billion. It's possible that this explains at least some of the difference -- increased population should increase demand (and prices). On the other hand, our technology today is vastly superior. Transportation, productivity, communications -- we have capabilities that would make our ancestors weep. We should be able to produce more and transport commodities more easily -- and that ought to reduce prices.

I haven't investigated this in any detail yet, but I can think of several possible reasons for the price increase:
  1. Increased population = increased demand. Population in 1915 was approximately 1.75 billion people. Population today is approximately 7.4 billion -- or, to put it another way, there are about four times as many possible consumers today. 
  2. The end of colonialism = increased costs. Cheap and exploited labor is certainly still with us, but it has become much harder to simply demand products without payment, to literally enslave people, and to "drain" the resources and labor of a country.8
  3. Minimal changes in technology = stagnant productivity. Many spices are produced and harvested essentially as they have been for centuries (if not millennia).9 This means that, at least for some spices, productivity is essentially unchanged, and there simply isn't enough being produced to meet demand.
  4. Reduced acreage = insufficient production. It is possible that land that was once used to produce spices may have been shifted to new more profitable uses (housing, manufacturing, or to other crops), further reducing production.10
  5. Increased competition. Although you would expect that new producers and synthetic flavorings (e.g. cinnamaldehyde [cinnamon], eugenol [clove], etc.) would increase supply (and thus reduce prices) it's possible that cheap synthetic flavors may have increased demand for the real thing. Does anyone actually like artificial banana flavor (isoamyl acetate)?11
  6. Changes in people's tastes. Tastes change, and we are currently going through a period when there is a global increase in demand for highly spiced foods, which should result in increased prices. On the other hand, paradoxically, there may have been a decline in demand for certain flavors, which has made some products rare. Perhaps the reason that mace, for example, is so expensive today is that the flavor is so subtle and similar to nutmeg that there's a limited market -- but a limited market which is willing to pay a premium price.12

As I said, I haven't actually researched this. But the pattern is intriguing, and I'm sure I'll come back to this in the future.


Notes

1 In addition, The Council for Economic Education of New York prepared an exercise, "What's the Big Deal About Spices?" for middle schools partly based on the late Dr. Munro's work. See: http://msh.councilforeconed.org/documents/978-1-56183-758-8-activity-lesson-19.pdf.

2 Exactly how much of a "drain" this actually constituted on the Empire is a bit hard to determine. Bostock and Riley in the early 19th century estimated it at "£1,400,000"; in my book, BONELESS, LEAN AND NOT FRIED: SIXTY RECIPES FOR THE FRIED FISH PHOBIC (which, remarkably enough, can actually be purchased here: https://www.amazon.com/Boneless-Lean-NOT-FRIED-Recipes-ebook/dp/B01DPJU5VG/ref=sr_1_1?s=books&ie=UTF8&qid=1468793167&sr=1-1&keywords=boneless%2C+lean#navbar ) I assumed each sesterce was valued at 0.073 grams of gold, so that 550 million sesterces would be worth 40,150,000 grams of gold or, at current value ($42.83/gram, according to http://www.goldgrambars.com/), about $1,719,624,500. Which is close to two billion dollars. Which is a lot.

I should also note that Pliny backtracks on that figure of 550 million sesterces a bit later: "At the very lowest computation, India, the Seres, and the Arabian Peninsula, withdraw from our empire one hundred millions of sesterces every year—so dearly do we pay for our luxury" (The Natural History 12:41).

And there's yet another problem. Bostock and Riley clearly say "five hundred and fifty millions," but Turner cites a figure of fifty million sesterces (2004, p. 81). For the time being I'm going to stick with the figure of 550 million. I get the feeling somebody has made an error somewhere. I hope it's not me.

3 See also Keay 2006, p. 242.

4 To express this a bit more comprehensibly -- from 1066 to 1971 the British pound (£) was divided into 20 shillings, each of which were in turn divided into 12 pennies (or pence). In other words, a dozen pennies made a shilling, and a score of shillings made a pound, and since 12 x 20 = 240, there would thus be 240 pennies to the pound. Taking the example, one penny in the Banda Islands would thus become £2.10s -- or ((2 x 240) + (10 x 12)) pennies, or 480 + 120 = 600 pennies.

5 Technically Alibaba (https://www.alibaba.com/) may be larger, but it's difficult to say for certain (and it depends a lot on which criteria you use to define "largest"). See: https://www.entrepreneur.com/article/248345 ; http://www.cnbc.com/2016/05/05/a-tale-of-two-companies-matching-up-alibaba-vs-amazon.html ; http://www.ecommercefuel.com/alibaba-vs-amazon/.

6 Non-McCormick spices from Amazon:
  • Whole white pepper: The Spice Lab
  • Whole ginger: Om India Plaza
  • Whole allspice: Spicy World
  • Whole nutmeg: Freckles International
  • Whole mace: Penzeys
7 Calculating relative value and purchasing power is tricky. Depending on the metric you choose, the value of a dollar from 1915 vs. 2016 can be as little as $17.10 or as much as $444.00. See https://www.measuringworth.com/uscompare/ .

8 See: http://www.ivarta.com/columns/OL_060206.htm#_edn5
https://www.academia.edu/18804851/critical_assessment_of_Dadabhai_Naorojis_poverty_and_un-British_rule_in_india_
https://books.google.com/books?id=6Vm0CAAAQBAJ&pg=PA170&lpg=PA170&dq=empire+built+on+colonial+exploitation+india&source=bl&ots=Gmy7mhrHL4&sig=ZRx95WUzq8Q7HJ6Iqfqk325stcM&hl=en&sa=X&ved=0ahUKEwi4iOmksv7NAhVTzGMKHaMrCq8Q6AEIiwEwDw#v=onepage&q=empire%20built%20on%20colonial%20exploitation%20india&f=false
http://www.theguardian.com/politics/2005/aug/20/past.hearafrica05
https://books.google.com/books?id=xVFNAgAAQBAJ&pg=PA437&lpg=PA437&dq=empires+built+on+colonial+exploitation&source=bl&ots=uTolvhLoRw&sig=aUzirhrs4IdnDFsYveitSu2cWBE&hl=en&sa=X&ved=0ahUKEwin_JPMsP7NAhULymMKHXc0DscQ6AEIZzAL#v=onepage&q=empires%20built%20on%20colonial%20exploitation&f=false

9 See Keay 2006, pp. 1-2; Turner 2004, pp. xxi-xxii; see also http://www.fao.org/docrep/x5047e/x5047e06.htm
http://www.smithsonianmag.com/smart-news/heres-how-cinnamon-harvested-valley-indonesia-180955063/?no-ist
http://science.howstuffworks.com/life/botany/cinnamon.htm ; however, note the modern production techniques that have been developed for black pepper production: http://www.ipcnet.org/pg/content/7/index.html

10See http://www.tandfonline.com/doi/abs/10.1080/1747423X.2011.620993 ; Abdul Rahman, Abdul Aziz and Mohd Ariff Hussein. 1992. Agricultural Taxation in Malaysia, FAO agricultural taxation studies. Food & Agriculture Organization of the United Nations. Online: https://books.google.com/books?id=ml976tNa3wAC&pg=PA10&lpg=PA10&dq=stagnating+pepper+production&source=bl&ots=3hjnTUUZFH&sig=Df_RkLIvFxfjnO5ZtfmpSX3M2GQ&hl=en&sa=X&ved=0ahUKEwiz8LjC84DOAhVM5GMKHfEMBKcQ6AEIMDAE#v=onepage&q=stagnating%20pepper%20production&f=false

11See Turner 2004, p. 300; see also http://www.popsci.com/history-flavors-us-pictorial ; http://www.businessinsider.com/facts-about-natural-and-artificial-flavors-2014-1 ;http://www.ediblegeography.com/fake-cinnamon-joins-artificial-vanilla-and-wins/

12See Turner 2004, p. 303; see also Pullar, Phillipa. 1971. Consuming Passions. London: Hamish Hamilton.

References

Baghdasaryan, Anna, Thierry Claudel1, Astrid Kosters, Judith Gumhold, Dagmar Silbert, Andrea Thüringer, Katharina Leski, Peter Fickert, Saul J. Karpen, and Michael Trauner. 2010. Curcumin improves sclerosing cholangitis in Mdr2−/− mice by inhibition of cholangiocyte inflammatory response and portal myofibroblast proliferation. Gut 59 (4): 521-530. Online: http://gut.bmj.com/content/59/4/521.long .

Cedars-Sinai Medical Center. "A Baker's Dozen Cold Remedies That Still Work A Century Later." ScienceDaily. ScienceDaily, 23 November 1999. Online: www.sciencedaily.com/releases/1999/11/991122205919.htm .

Foster, Bethany. 2016. The Religious Significance of Turmeric. Online: http://peopleof.oureverydaylife.com/religious-significance-turmeric-5804.html .

Gorman Chester. 1971. The Hoabinhian and After: Subsistence Patterns in Southeast Asia during the Late Pleistocene and Early Recent Periods. World Archaeology 2 (3): pp. 300-320.

Griffith University. "Alternative Medicines Need To Be Considered In Diabetes Management, Researcher Says." ScienceDaily. ScienceDaily, 5 July 2007. Online: http://www.sciencedaily.com/releases/2007/07/070704144637.htm .

Halsall, Paul. 1998. "Vasco da Gama: Round Africa to India, 1497-1498 CE," in The Internet Modern History Sourcebook. Online: http://legacy.fordham.edu/halsall/mod/1497degama.asp .

Keay, John. 2006. The Spice Route: A History. California Studies in Food and Cuisine, Darra Goldstein ed. Berkeley and Los Angeles: University of California Press.

Long, Min, Shasha Tao, Montserrat Rojo de la Vega, Tao Jiang, Qing Wen, Sophia L. Park, Donna D. Zhang, and Georg T. Wondrak. Nrf2-Dependent Suppression of Azoxymethane/Dextran Sulfate Sodium–Induced Colon Carcinogenesis by the Cinnamon-Derived Dietary Factor Cinnamaldehyde. Cancer Prevention Research May 2015 8: 444. Online: http://cancerpreventionresearch.aacrjournals.org/content/8/5/444.full .

Milton, Giles. 1999. Nathaniel's Nutmeg or, The True and Incredible Adventures of the Spice Trader Who Changed the Course of History. New York: Farrar, Straus and Giroux.

Pliny the Elder (Gaius Plinius Secundus) (23-79 CE). The Natural History. John Bostock (1773-1846) and Henry T. Riley (1773-1878), translators. Online: http://www.perseus.tufts.edu/hopper/text?doc=urn:cts:latinLit:phi0978.phi001.perseus-eng1 .

Saul, Hayley, Marco Madella, Anders Fischer, Aikaterini Glykou, Sonke Hartz, and Oliver E. Craig. 2013. Phytoliths in Pottery Reveal the Use of Spice in European Prehistoric Cuisine. Online: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0070583

Shaffer, Marjorie. 2013. Pepper: A History of the World's Most Influential Spice. New York: Thomas Dunne Books.

Sherwin Miller Museum of Jewish Art. 2016. "Ritual Objects." Online: http://jewishmuseum.net/collections/permanent-collection/permanent-collections/ .

Skulas-Ray A. C., P. M. Kris-Etherton, D. L. Teeter, C.-Y. O. Chen, J. P. Vanden Heuvel, and S. G. West. A High Antioxidant Spice Blend Attenuates Postprandial Insulin and Triglyceride Responses and Increases Some Plasma Measures of Antioxidant Activity in Healthy, Overweight Men. Journal of Nutrition, 2011; 141 (8): 1451 .

Solheim, William G. 1972. An earlier agricultural revolution. Scientific American 226: pp. 34-41.

Turner, Jack. 2004. Spice: The History of a Temptation. New York: Alfred A. Knopf.

Wednesday, July 13, 2016

To Make a Body

"But once upon a time (my crest has long since fallen) I had a mind to make a body of more or less connected legend, ranging from the large and cosmogonic, to the level of romantic fairy-story..."

Letter from J.R.R. Tolkien to Milton Waldman, c. 1951. In Scull, Christina and Wayne G. Hammond. 2001. Tolkien's Art: A Mythology for England. Revised edition. Lexington KY: The University Press of Kentucky.



I recently read a series of novels.1 I'm not going to name the author or the series. This isn't a work of literary criticism. It's more "meta" than that. What I want to talk about is worldbuilding.

Worldbuilding is usually thought of in terms of fantasy or science fiction (and to a lesser extent historical fiction). But all fiction involves worldbuilding:

"Whether your tale is set in a real place or an imagined one, you need to establish your characters’ world so that the reader can suspend disbelief and fully engage with their story" [Sambuchino 2014]

The series I've been reading focuses on a society of space traders and their spaceships (actually the word "focus" is a little weak -- they hardly ever leave their ships, and they hardly ever do anything but trade). There's nothing inherently wrong with that. Not every book needs to spend time at the beach or the farm or the sea, or hiking or biking or climbing tall mountains. One act plays set on a bare stage are perfectly valid.

The books in this series do an excellent job describing their circumscribed world -- sometimes in amazing detail, sometimes in well-crafted hand-waving and bafflegab -- and in the end you really do have a nice impression of how a trading spaceship might function. We see the crew, the officers, the dock personnel, and the bars and nightclubs and restaurants that the spacers visit. There's even a wisecracking waitress or two. We even get hints -- just hints -- that the worlds our spacers visit are very different -- there are ocean worlds, agricultural worlds, asteroid colonies, heavy gravity worlds. We never actually see them, but we're told they're really, really different.

Let's leave aside the fact that a planet -- an Earth-sized ball -- has a surface area of around 510 million square kilometers (about 197 million square miles). That's a lot of territory. On Earth we have environments that range from cold enough to freeze carbon dioxide or radon gas out of the atmosphere2 or hot enough to melt lead (327°C), zinc (420°C), antimony (630°C), or magnesium (639°C).3 The surface of the Earth has an enormous variety of environments, from immense pressure in the deep oceans to near-stratospheric vacuum, from arctic to tropical climates, from wet to dry, from mountain to shoreline to plains. The idea of an "agricultural world" seems ludicrous. But hey, Frank Herbert in Dune can have a "desert planet," and if that's okay with him, I guess we'll just let it slide.

What I'm appalled by is the culture. Not "cultures." Just culture. There's only the one.

Everywhere we go, on every ship, in every port, there are nightclubs and restaurants, shops and security officers, cooks and waitresses and (occasionally) cheerful countermen. There are flea markets, not souks, there are cafes, not teahouses. Everybody wears the same clothes. Everybody speaks the same language. Everybody is the same.

Everybody.

Before we continue talking about that impossibility, let's consider the food.

On every ship, in every port, there are places to eat. Aside from a few references to North African dishes, Chinese food, and a brief mention of curry (I'm guessing Indian, not Thai curry), the food in those places would have been considered bland in Des Moines in 1940.

For breakfast they eat bacon and eggs, toast, coffee, and frequently some form of fried potato. Once in a while you might get pancakes and sausage. Rarely cereal and milk. That's breakfast. Everywhere.

On Earth we eat dumplings for breakfast (parts of China); or fried bread and saltfish (Guyana); or miso soup (Japan); or vegetable stew with lentils (India); or white rice with dried fish (Philippines); or cornmeal and bean cakes (Nigeria); or congee4 (Vietnam), or Vegemite (Australia), or chilaquiles (Mexico), or kimchi (Korea). That's what people from Earth eat for breakfast.5

But out in the infinite vastness of space? Bacon. Eggs. Toast. Coffee.

Just where do the eggs come from? How about those pigs? Or the wheat? "Planets" is not much of an answer. That's like saying "the store." It shows a lack of knowledge.  Or caring.

Does anybody mind eating bacon? Or meat in general? Apparently not.  When they go out to eat in a fancy restaurant they order steak. In space no one can hear vegans scream.

There doesn't seem to be any evidence of religion. Any religion. Nobody prays. Not to Jesus, not to Lord Buddha, not to Allah, not to Aleister Crowley.6 Nobody bows toward Mecca or Jerusalem or Salt Lake City. A few people are superstitious. But nobody seems overly concerned about what Douglas Adam's fictional philosopher Oolon Colluphid in The Hitchhiker's Guide to the Galaxy referred to as "this God person."7

Everybody speaks the same language. Nobody has a noticeable accent. Some people have quirky ways of talking, but there's never any evidence that anybody speaks anything other than English.8 Nobody even seems to speak English as a second language. And though there are "ethnic" names (African, Asian, Slavic), they don't seem to mean anything. People have families. They have mothers and fathers. They don't have tribes or nations. Conflicts are always over money or personal animosity; I can't find any evidence of ideology. Because everybody's beliefs are the same.

Even the technology seems the same. Nobody has a technological "edge." Nobody has any stunning breakthroughs. And the technology seems surprisingly dated. Yes, they're traveling between the stars,9 but they type on keyboards, mop floors, press buttons, and climb up and down ladders. Aside from visiting other planetary systems, nothing here seems particularly advanced over the early 2000s. And everybody uses the same stuff (it may not always be compatible -- you probably can't replace a door hinge from a 2015 Toyota with one from a 1995 Ford -- but they're not fundamentally different).

I could keep going, but there's no point. What we have here is an example of inadequate worldbuilding.

"You can spend hours and hours thinking about the history and culture and mores of your imaginary land, and how people interact and the ways that different religious and ethnic groups collide. But if you don't make me feel the dirt under my fingernails, then you still haven't created a real place. If the reader doesn't get a little lightheaded from the stench of the polluted river, or transported by the beauty of the geometric flower gardens, then something is missing" [Anders 2013]
What Anders is referring to is "sense of place." It's what makes St. Petersburg Florida different from St. Peterburg Russia -- it's language and history and religion and food and weather and ethnicity and topography and how often people smile at strangers and everything else. To make a world, a world so real that a reader falls in and drowns in the delicious richness of it, you have to create it.

Building worlds isn't easy. The Science Fiction and Fantasy Writers of America (SFWA) has a very interesting -- and intimidating -- website that any worldbuilder ought to visit: "Fantasy Worldbuilding Questions: The World," by Patricia C. Wrede (http://www.sfwa.org/2009/08/fantasy-worldbuilding-questions/). There are no less than 470 questions a worldbuilder (fantasy or science fiction) may need to consider. Questions like:

  • How many people are there in this country? How does this compare with world population? What is considered a small town/large town/city in terms of number of people?
  • How are the continents laid out? If there is more than one moon/sun, how does this affect winds, tides, and weather generally?
  • When meeting someone, how are they greeted — wave, handshake, bow, some other gesture? How did the greeting gesture originate (example: shaking hands to prove one’s weapon hand was empty)?
  • What things are considered normal and acceptable in this society that would not be considered normal or acceptable in yours? (Examples: dueling, drugs, open homosexuality, polygamy, infanticide.)
  • How are treaties arranged? Are there any significant ones currently in force or coming up for signing?
  • What inventions or advances have not been made that you would normally expect to see at this stage of technological development? Which ones are about to be made?

I don't want to imply that every writer invariably has to deal with all these questions (or the other 464 questions either). Sometimes an author isn't interested in exploring every aspect of a particular story. George Orwell, in his remarkable discussion of Charles Dickens, notes that:
"... Dickens hardly writes of war, even to denounce it. With all his marvellous powers of description, and of describing things he had never seen, he never describes a battle ... Probably the subject would not strike him as interesting, and in any case he would not regard a battlefield as a place where anything worth settling could be settled."10
This "lack" certainly doesn't detract from Dickens. It wasn't his focus, it wasn't his purpose, and it wasn't the story he was trying to tell.  As I said before, one act plays set on a bare stage are valid, if that's the kind of story you want to tell. But I've read far too many books recently that broke no new ground in terms of plot or character, and waved away any tedious questions about the structures of society -- about how and why things work -- in order to focus on some allegedly exciting space battles.

Creating a believable world is not a luxury. Without it the characters in a story, no matter how deeply they feel, no matter how clever their dialog, no matter how heroic (or cowardly) they are -- they won't live. They won't live because they have no place. And the reader is going to be disappointed. They may not know exactly why they're disappointed. But they'll know that something's wrong.


Notes


1 I'm lying; I'm only on book 5 of 6.

2 The coldest temperature ever recorded on the Earth's surface is -89.2° C (-128.6° F) at Vostok Station, Antarctica, on July 21, 1983. Carbon dioxide's freezing point is -78° C; radon's freezing point is -71.2° C.

3 Water temperatures in hydrothermal vents ("black smokers") can get up to 640° C; they don't flash into steam because of the immense pressure. Of course, lava gets even hotter (700°C to 1,200°C), but I don't think of that so much as an "environment" as a "calamity."

4 A kind of rice porridge. For a representative recipe see: http://www.pbs.org/food/recipes/vietnamese-chicken-rice-soup-congee/ ;

5 See: https://www.buzzfeed.com/ailbhemalone/breakfasts-around-the-world?utm_term=.kgO7PvKy2M#.caO830PQAp ; http://www.independent.co.uk/life-style/food-and-drink/features/what-people-eat-for-breakfast-around-the-world-a6730126.html ; http://www.nytimes.com/interactive/2014/10/08/magazine/eaters-all-over.html?_r=1

6 Never heard of Crowley? Lucky you. Aleister Crowley (1875-1947) was a Satanist, a poet, and a bisexual, and he quite scandalized both Britain and Italy before World War II. Many of his works are available online. I'm not giving you any links.

7 Adams, Douglas. 1995 (2009 reissue edition). The Hitchhiker's Guide to the Galaxy. New York: Del Rey Books. Amazon: https://www.amazon.com/Hitchhikers-Guide-Galaxy-Douglas-Adams/dp/0345391802/ref=sr_1_5?s=books&ie=UTF8&qid=1468536773&sr=1-5&keywords=douglas+adams ; Powell's Books: http://www.powells.com/book/hitchhikers-guide-to-the-galaxy-book-1-9780345391803/1-4

8 Or whatever "standard language" they're supposedly speaking that renders into perfect, idiomatic early twenty-first century American English.

9 They use the "space-bending" method, a "discontinuous" method of effectively traveling faster than light. For a taxonomy of different methods of faster than light travel, see: http://www.projectrho.com/stardrv.txt .

10 Orwell, George (pseudonym of Eric Blair). 1940. "Charles Dickens," in Inside the Whale and Other Essays. London: Victor Golancz. Online: http://gutenberg.net.au/ebooks03/0300011h.html


References


Anders, Charlie Jane. 2013. 7 Deadly Sins of Worldbuilding. Online: http://io9.gizmodo.com/7-deadly-sins-of-worldbuilding-998817537

Bryant, Stephanie Cottrell. Magical World Builder's Guide. Online: http://www.web-writer.net/fantasy/days/

Malone, Ailbhe. 2015. This is what Breakfast Looks Like in 22 Countries Around the World. Online: https://www.buzzfeed.com/ailbhemalone/breakfasts-around-the-world?utm_term=.emzp73M1k#.bxdxdep0V

Sambuchino, Chuck. 2014. Tips on World Building for Writers -- How to Make Your Imaginary World Real. Online: http://www.writersdigest.com/editor-blogs/guide-to-literary-agents/tips-on-world-building-for-writers-how-to-make-your-imaginary-world-real

Walloga, April. 2015. What people eat for breakfast around the world. Online: http://www.independent.co.uk/life-style/food-and-drink/features/what-people-eat-for-breakfast-around-the-world-a6730126.html

Wendig, Chuck. 2013. 25 Things You Should Know About Worldbuilding. Online: http://terribleminds.com/ramble/2013/09/17/25-things-you-should-know-about-worldbuilding/

Wollan, Malia. 2014. Rise and Shine: What kids around the world eat for breakfast. Online: http://www.nytimes.com/interactive/2014/10/08/magazine/eaters-all-over.html?_r=0

Wrede, Patricia C. 1996. Fantasy Worldbuilding Questions: The World. Online: http://www.sfwa.org/2009/08/fantasy-worldbuilding-questions-the-world/









Wednesday, July 6, 2016

Something there is that doesn't love

Something there is that doesn't love a wall ...

Robert Frost (1874-1963), "Mending Wall," in North of Boston, Henry Holt and Company, 1917. Online: http://www.bartleby.com/people/Frost-Ro.html .


Introduction


On June 16, 2015 Mr. Donald John Trump announced that, if elected President of the United States:

“I would build a great wall. And nobody builds walls better than me, believe me. And I’ll build them very inexpensively. I will build a great great wall on our southern border and I’ll have Mexico pay for that wall.”
[Source: http://www.politico.com/story/2015/06/donald-trump-2016-announcement-10-best-lines-119066; see also http://blogs.wsj.com/washwire/2015/06/16/donald-trump-transcript-our-country-needs-a-truly-great-leader/]


Length


Leaving aside the advisability of such a project -- is it possible? Could you really build a wall along the entire 1,989 miles (3,201 kilometers) of the US-Mexico border?

Keep in mind there already is a "wall" between the US and Mexico. Sort of. At the moment there are 652.6 miles (1,050.25 kilometers) of fencing; of that, 299.8 miles (482.5 kilometers) are vehicle barriers (and not intended to stop pedestrians). To put it another way, we already have a "wall" along more than one third of the border.

And 652.6 miles is a lot of wall, right?

Actually, no. By historical standards it's not all that impressive. The fact is, people have been constructing "Great Walls" (and barriers and fences) for an awfully long time.

According to Evan Andrews, the earliest "great wall" was built approximately 4,000 years ago, by the Sumerians; it's called "the Amorite Wall" because it was made to deter the Amorites.1 The ten longest great walls (including fencing and discontinuous barriers) that have ever existed are:
  1. 21,196 km: The Great Wall of China
  2. 5,614 km: Dingo Fence ("Dog Fence")2
  3. 4,000 km: Inland Customs Line ("Great Hedge of India," "Indian Salt Hedge")
  4. 3,406 km: India-Bangladesh Barrier
  5. 3,256 km: Rabbit-proof Fence ("State Barrier Fence of Western Australia")2
  6. 2,700 km: Moroccan Wall ("The Berm") [located in Western Sahara]
  7. 2,688 km: The Atlantic Wall [World War II, coastal Europe and Scandinavia]
  8. 1,420 km: China-North Korea Barrier
  9. 1,393 km: Inner German Border [between East and West Germany]
  10. 1,000 km: Serpent's Wall [Ukraine]


Construction


Walls (barriers, fences, whatever) can be made from almost anything -- sand, clay, packed earth, caliche;3 wood, bamboo; cacti, Euphorbias, thornbushes, ocotillo;4 mud brick, bricks and mortar, dry stone, concrete; iron, steel; even glass. The point of a Great Wall is stopping people. Today there's a strong preference for chain-link and barbed wire fencing (both invented in the 19th century).

     To each the boulders that have fallen to each. 
     And some are loaves and some so nearly balls 
     We have to use a spell to make them balance: 
     "Stay where you are until our backs are turned!"
     Robert Frost, "Mending Wall"

Stone, as Mr. Frost noted, does not always make the best walls.

What does Mr. Trump propose to build his wall out of?

On August 19, 2015:

"So you take precast [concrete] plank. It comes 30 feet long, 40 feet long, 50 feet long. You see the highways where they can span 50, 60 feet, even longer than that, right? And do you a beautiful nice precast plank with beautiful everything. Just perfect. I want it to be so beautiful because maybe someday they'll call it The Trump Wall. Maybe. So I have to make sure it's beautiful, right? I'll be very proud of that wall. If they call at this The Trump Wall, it has to be beautiful. And you put that plank up and you dig your footings. And you put that plank up -- there's no ladder going over that. If they ever go up there, they're in trouble, because here's no way to get down. Maybe a rope."
[http://www.realclearpolitics.com/video/2015/08/19/trump_on_border_maybe_theyll_call_it_the_trump_wall.html]

On December 2, 2015:

"I'll tell you what it's going to be made out of. It's going to be made of hardened concrete and it's going to be made out of rebar and steel."
[http://www.c-span.org/video/?c4589206/donald-trump-explains-plan-border-wall]

On February 9, 2016:

"... we don’t need 2,000 [miles of wall], we need 1,000 [miles of wall] because we have natural barriers, et cetera, et cetera, and I’m taking it price per square foot and a price per square, you know, per mile, and it’s a very simple calculation. I’m talking about precasts [concrete panels] going up probably 35 to 40 feet up in the air."
[https://www.washingtonpost.com/news/fact-checker/wp/2016/02/11/trumps-dubious-claim-that-his-border-wall-would-cost-8-billion/]

On February 12, 2016:

"So I got a call from one of the reporters yesterday, and they said, 'The president of Mexico said they will not under any circumstances pay for the wall," Trump said. "They said to me, 'What is your comment?' I said the wall just got ten feet higher."
[http://www.msnbc.com/msnbc/donald-trump-says-his-wall-would-cost-8-billion]

On February 25, 2016:

WOLF BLITZER: So if you don't get an actual check from the Mexican government for $8 billion or $10 billion or $12 billion, whatever it will cost, how are you going to make them pay for the wall?
TRUMP: I will, and the wall just got 10 feet taller, believe me.
[https://www.washingtonpost.com/news/the-fix/wp/2016/02/25/the-cnntelemundo-republican-debate-transcript-annotated/]

On March 2, 2016:

"We need 1,000 miles and we have all of the materials. We can do that so beautifully. And this is going to be a serious wall. This is going to be high wall. This is going to be a very serious wall."
[http://time.com/4245134/super-tuesday-donald-trump-victory-speech-transcript-full-text/]

On June 16, 2016:

"I would build a great wall, and nobody builds walls better than me, believe me, and I’ll build them very inexpensively, I will build a great, great wall on our southern border. And I will have Mexico pay for that wall."
[http://blogs.wsj.com/washwire/2015/06/16/donald-trump-transcript-our-country-needs-a-truly-great-leader/]

It seems that the proposed wall is supposed to be made out of concrete (probably precast concrete panels).  It's going to be "high" (somewhere between 35 and 60 feet [10 to 18 meters]) tall. It's going to be "beautiful." And it's going to be "great."

So let's consider concrete. Concrete is a complex physical and chemical mix of aggregate (sand, gravel, broken stone) and cement, which is made from lime (calcium hydroxide, also known as "slaked lime"), combined with water, which slowly hardens. Making concrete is energy intensive. It's also quite polluting; something like 5% of global human-created carbon dioxide comes from manufacturing cement.5

The earliest known deliberately created concrete (as opposed to natural concretes, like caliche) dates back about 2,700 years. The Nabatean Arabs in Petra, in what is now Jordan, used it to create waterproof cisterns. The Romans, of course, became masters of concrete. Many examples of Roman concrete are still visible today. The roof of the Pantheon, created in 142 CE, is still one of the world's outstanding structures.6

Concrete can be durable, but it's not permanent. Leaving aside errors and omissions (incorrect aggregates, contaminated water) and environmental damage (freeze-thaw, air pollution, salt, acids), one of the biggest problems with modern concrete is steel.

Most concrete today is reinforced. Generally speaking, that's a good thing. It makes it possible for concrete to span enormous distances and support great weight. But most reinforced concrete is made with steel. And steel rusts. The result is a chemical reaction that eats concrete from the inside out; it's sometimes called "concrete cancer."7

"Early 20th-century engineers thought reinforced concrete structures would last a very long time – perhaps 1,000 years. In reality, their life span is more like 50-100 years, and sometimes less. Building codes and policies generally require buildings to survive for several decades, but deterioration can begin in as little as 10 years."
[https://theconversation.com/the-problem-with-reinforced-concrete-56078]

Can you make a "great wall" with concrete? Yes, for a given value of "great":

  • The Inner Harbor Navigation Canal-Lake Borgne Surge Barrier near New Orleans is 1.4 miles (2.25 kilometers) long and made of concrete panels 26 feet tall. 
  • The wall surrounding the Bab Amr quarter in Homs, Syria is 3 miles (5 kilometers) long and constructed of concrete panels 3 meters tall. 
  • The walls around Alphaville in Sao Paulo, Brazil are 40 miles (64 kilometers) long and (mostly) made from 2.5 meter tall concrete topped with barbed wire (it's not quite clear if this is poured or pre-cast concrete).
  • Israel's West Bank Barrier (also known as "The Separation Fence," "The Separation Barrier," "The Security Fence," "The Anti-Terrorist Fence," "The Annexation Wall," "The Apartheid Wall," and "The Apartheid Fence") is mostly constructed of barbed wire and chain-link fence, but about 5% is built from concrete panels which are up to 8 meters tall; since the entire barrier is supposed to be 650 kilometers (403 miles) long when completed, that would mean that the concrete portion is roughly 30 kilometers (19 miles). 
  • South Korea's Saemangeum Seawall is mostly concrete, and is 33 kilometers long and the average height is 36 meters (118 feet) (note that this is poured concrete, not pre-cast concrete panels).
  • China has proposed a system of concrete seawalls along its coastline that will, if completed, extend approximately 11,000 kilometers (6,835 miles) (note that this is poured concrete, not pre-cast concrete panels).8


Purpose


     Before I built a wall I’d ask to know 
     What I was walling in or walling out, 
     And to whom I was like to give offense.
     Robert Frost, "Mending Wall"

Mr. Frost brings up a valid point: Why build a wall?

What Mr. Trump has proposed is a border wall; that is, a separation barrier along an international border. Its purpose is to stop the movement of people, to prevent people from entering (or leaving) a country.

Border barriers are actually fairly common today. According to Rick Noack there are literally dozens of walls (of one sort or another) separating countries today.9

In alphabetical order:
  1. Belize-Guatemala barrier (proposed)
  2. Botswana-Zimbabwe barrier
  3. Brunei-Limbang border (Brunei-Malaysia)
  4. Bulgaria-Turkey border
  5. Ceuta border fence (Spain-Morocco)
  6. China-North Korea barrier
  7. Chinese-Korean border fence
  8. Costa Rica-Nicaragua border
  9. Egypt-Gaza Strip barrier
  10. Estonia-Russia border fence
  11. Hungary-Croatia barrier
  12. Hungary-Serbia barrier
  13. India-Bangladesh barrier
  14. Indian Kashmir barrier
  15. Indo-Bangladeshi barrier
  16. Indo-Burma barrier
  17. Iran-Pakistan barrier
  18. Kazakh-Uzbekistan barrier
  19. Korean Demilitarized Zone
  20. Kuwait-Iraq barrier
  21. Macedonia-Greece border
  22. Malaysia-Thailand barrier
  23. Melilla border fence (Spain-Morocco)
  24. Pakistan-Afghanistan barrier
  25. Pakistan-Iran barrier
  26. Saudi Arabia-Iraq barrier
  27. Saudi Arabia-Yemen barrier
  28. Slovenia-Croatia barrier
  29. South Africa-Zimbabwe border
  30. Turkmenistan-Uzbekistan barrier
  31. Ukraine-Russia barrier
  32. United Arab Emirates-Oman barrier
  33. United States-Mexico border fence (partially completed)
  34. Uzbekistan-Afghanistan barrier
  35. Uzbekistan-Kyrgyzstan barrier
In order by length:
  • 3,360 km: United States-Mexico barrier (proposed; 1,050.25 km completed)
  • 3,268 km: Indo-Bangladeshi barrier
  • 2,900 km: South Africa-Zimbabwe Border
  • 2,400 km: Pakistan-Afghanistan barrier
  • 2,000 km: Ukraine-Russia barrier
  • 1,700 km: Turkmenistan-Uzbekistan barrier
  • 1,624 km: Indo-Burma barrier
  • 1,416 km: Chinese-Korean border fence
  • 900 km: Saudi Arabia-Iraq barrier
  • 870 km: Uzbekistan-Kyrgyzstan barrier
  • 700 km: Iran-Pakistan barrier
  • 650 km: Malaysia-Thailand border
  • 644 km: Slovenia-Croatia barrier (under construction)
  • 550 km: Indian Kashmir barrier
  • 500 km: Botswana-Zimbabwe barrier
  • 410 km: United Arab Emirates-Oman barrier
  • 248 km: Korean Demilitarized Zone
  • 209 km: Uzbekistan-Afghanistan barrier
  • 193 km: Kuwait-Iraq barrier
  • 175 km: Hungary-Serbia barrier
  • 108 km: Estonia-Russia border fence
  • 75 km: Saudi Arabia-Yemen barrier
  • 45 km: Kazakhstan-Uzbekistan barrier
  • 41 km: Hungary-Croatia barrier
  • 30 km: Bulgaria-Turkey border
  • 30 km: Macedonia-Greece border
  • 20 km: Brunei-Limbang (Brunei-Malaysia)
  • 11 km: Melilla border fence (Spain-Morocco)
  • 8 km: Ceuta border fence (Spain-Morocco)
  • 3.1 km: Egypt-Gaza Strip barrier
  • -- Belize-Guatemala (proposed)
  • -- Costa Rica-Nicaragua (proposed)


Cost

"The wall is probably [going to cost] $8 billion, which is a tiny fraction of the money that we lose with Mexico"
[http://www.cnn.com/2016/02/09/politics/donald-trump-border-wall-cost-8-billion/]  

The 652.6 miles (1,050.25 kilometers) of the current US-Mexico border fence has already cost somewhere between $2.4 billion and more than $7 billion. So far.10 

Construction costs vary depending on local terrain. According to Elisabet Vallet, in 2008 the estimate was $1 million to 4.5 million per kilometer, but in the Otay Mountains near San Diego the cost was $6.4 million per kilometer. Samantha Sais reported slightly different figures in 2013: between $400,000 to $15 million per mile, averaging $3.9 million per mile; to deal with the more challenging topography near San Diego (presumably the Otay Mountains) $58 million was spent to build a 3.5 mile section of fencing.11 

The highest elevation in the Otay Mountains is 3,566 feet (1,087 meters), and along the actual border the highest elevation is about 1,200 feet (366 meters). There are places along the US-Mexico border, near Sierra Rica in Chihuahua, and near the town of Sunland Park New Mexico, for example, where the border crosses mountains that are nearly 5,000 feet tall (1,500 meters). If it cost roughly $15 million per mile in the relatively low elevations located near San Diego, it would presumably cost at least as much (if not more) in these locations.

Is a figure of $8 billion to build a two thousand mile (or maybe just a one thousand mile) concrete wall reasonable?

Probably not. Mr. Trump has changed the estimated cost of his wall several times, most recently to as much as $12 billion. Experts believe that figure is extremely low; most place the cost at $25 billion. And walls have to be maintained. In 2010 US Customs and Border Protection spent $7.2 million just repairing 4,037 holes in the current fence.12 Maintenance costs for the 652.6 miles of the current barrier have been estimated at $49 billion over 25 years, or roughly $2 billion per year.13 It's reasonable to assume that maintenance costs on a longer fence would be considerably higher.

It has been suggested that a "virtual fence," a high tech system of sensors, cameras and drones, might be a less expensive alternative. That hasn't proven to be the case.

A 53 mile (85.3 kilometers)  pilot project in Arizona, "Project 28" of the "Secure Border Initiative network" (or "SBInet") that began in 2006 was cancelled in 2011 after becoming a billion dollar failure (with projected costs ballooning up to $30 billion). Boeing, the contractor, failed "to understand the complexities of border management [which] can ultimately push costs up for government clients while undermining the value of the technologies implemented." The program suffered from management and technology failures. because "Boeing has had trouble getting the different components to work together."14

Static barriers by themselves are not particularly effective at stopping migration. Whatever kind of wall is built, people are going to be needed to patrol and maintain it.  In a highly critical article ("dyspeptic" might be a better word) Mark Hewitt summed it up this way: "If the cops go home, the illegals will defeat the fence."15

People have to be paid. There are currently over 21,000 Border Patrol Agents; salaries start at $49,000 per year,16 which means that salaries alone cost over $1 billion per year -- and that's with our current wall. It seems reasonable to assume that more Agents will be needed if the wall is expanded, vastly increasing personnel expenses.

And there are other costs: private lands along the border would have to be purchased; Native American lands would have to be acquired (which would involve treaty negotiations); there have been vehement objections from Mexico, potentially causing a political crisis, as well threatening our relationship with our second largest trading partner (Mexico already objects to the current fence, and is positively apoplectic at the idea that they would pay for a new one);17 and there are considerable environmental costs as well.18

And then there are the "costs" of unintended consequences. It's generally believed that the current US-Mexico border fence has prevented some people from entering the US. But many have simply shifted from relatively safe zones to desert and mountain areas that aren't currently "walled," resulting in hundreds of deaths.19 Of course, many people (half or more) who are in the US illegally don't cross the US-Mexico border at all. They enter legally (on student, tourist, or work visas) and simply "overstay."20 A fence -- no matter how spectacularly long or how high or how "beautiful" -- would do nothing to deal with them.



Need and Desire

"I want it to be so beautiful because maybe someday they'll call it The Trump Wall. Maybe. So I have to make sure it's beautiful, right? I'll be very proud of that wall. If they call at this The Trump Wall, it has to be beautiful."
[http://www.realclearpolitics.com/video/2015/08/19/trump_on_border_maybe_theyll_call_it_the_trump_wall.html]
Who wants a wall?

A March 31, 2016 poll by the Pew Research Center found that only 38% of respondents nationwide were in favor of building a wall along the US-Mexican border. On the other hand, a June 28, 2016 poll by the University of Texas/Texas Politics Project found a slim majority (52%-48%) of Texans favored building a wall.21

Many public officials in the immediate border region are opposed to a wall:

"I think when you build a wall, it's a wall of shame."
Laredo, Texas Mayor Raul Salinas
[http://www.npr.org/templates/story/story.php?storyId=15315131]

"Why try to force [on] us your way of thinking when you don't even live here," he said. "It's not affecting you. And, if you're so worried about whatever you're worried about, why not build a fence around your state."
Brownsville, Texas Mayor Patricio Ahumada
[http://www.npr.org/templates/story/story.php?storyId=15315131]

"I say that those who want this fence don’t understand the border, don’t understand our sense of community"
Del Rio, Texas Mayor Efrain V. Valdez
[http://www.washingtontimes.com/news/2008/feb/21/texas-cities-oppose-border-fence/]

"I strongly believe we don't need it," he said. "It's an eyesore. It's a dangerous thing. We need to build relations with Sonora and Mexico."
Nogales, Arizona Mayor Arturo Garino
[http://www.cnn.com/2013/07/12/us/nogales-razor-wire/]

“There’s no boogeyman on the south side of the border. We know that.”
Former San Diego Mayor Jerry Sanders
[https://www.washingtonpost.com/national/build-a-wall-on-the-border-no-thanks-says-san-diego/2015/10/31/f821073e-71d9-11e5-8d93-0af317ed58c9_story.html]

"Like many communities on the border, we have a much more fluid idea about crossing it."
Jon Barela, New Mexico Secretary for Economic Development
[http://america.aljazeera.com/articles/2014/5/28/a-binational-townontheusmexicoborder.html]

There are many possible adverse results from building a border wall, but perhaps the most interesting is that it may actually increase illegal immigration:

"... the [current US-Mexico] barriers were effective enough to redirect the flow of migrants to more dangerous zones ... but ... the hardship of the border trip encouraged migrants to remain in United States territory for longer periods of time ... Hispanic migrants lost any incentive to remain near the American side of the border after crossing, as they were no longer able to shuttle between the two countries. ...The Hispanic population skyrocketed in areas of the United States that were previously "immigration free," and this amplified in a vicious cycle the identity conflicts that put pressure on the political system to reinforce the border deployment."22


Final Thoughts


Is it actually possible to build a "beautiful" 2,000 mile wall (or maybe just a 1,000 mile wall), made of concrete, along the US-Mexico border?

Yes. Of course it is.

With enough money, given current technology, it could be done. It would cost roughly the same as the 2016 budget of the US National Institutes of Health, or the Federal student financial aid program, or the budget for NASA and all other Federally-funded science and research labs. It would cost roughly twice the budget of all Federally-funded programs for Special Education, and considerably more than the current budget for Customs and Border Protection.23 It would damage relations with Mexico, and possibly with other nations, too. It would require a substantial increase in Border Patrol personnel. It would cause potentially terrible environmental problems.

But it could be done. If there was a reason to build it.

Migration into the US from Mexico is currently at its lowest level since the 1940s. According to the Pew Research Center, the current net migration rate from Mexico is actually less than 0%.24 It was not our current border fence that was the crucial factor in this massive change (although increased enforcement of immigration laws certainly may have contributed to it). It was primarily because of changing economic and social factors, including the 2008 US economic recession.  But the number one reason Mexican citizens give for returning to Mexico: Family reunification.25

States have been building "Great Walls" to secure their borders for at least 4,000 years. Sometimes they've been effective. For a while. But they're never a permanent solution. People migrate for a variety of reasons -- economic, social, and environmental. The need (and the desire) to move doesn't end because there's a wall in the way. No wall is impregnable. Over, around or through, with enough effort, any wall can be overcome.

From Sumeria's Amorite Wall, to China's Great Wall, to the Berlin Wall, to the 3.1 kilometers of the Egypt-Gaza Strip barrier, "Great Walls" can impede the movement of people. But only at great cost, and only for a limited period of time. I can't help but wonder what our urge to separate ourselves (and to wall ourselves in) says about us, and what the final price of such an effort might be.

     I see him there  
     Bringing a stone grasped firmly by the top 
     In each hand, like an old-stone savage armed. 
     He moves in darkness as it seems to me
     Robert Frost, "Mending Wall"


Notes


1 http://www.history.com/news/history-lists/7-famous-border-walls. It was 270 kilometers long and stretched between the Tigris and Euphrates rivers. Maybe it worked. There haven't been any Amorites since 1200 BCE.

2 Australia is the home of two of the longest structures on the planet. They are both "pest exclusion fences" -- that is, they're designed to restrict the movement of animals, not people.

The "Dingo Fence" was finished in 1885, and is actually the result of joining together three smaller fences: Queensland's 2,500 kilometer (1,553 miles)"Great Barrier Fence" (or "Wild Dog Barrier Fence 11"), New South Wales's 257 kilometer (160 miles) "South Australian Border Fence," and the 2,225 kilometer (1,383 miles) "Dog Fence" in South Australia.

There are actually two "Rabbit-proof fences" in Australia; in addition to the 3,256 kilometers (2,023 miles) of the State Barrier Fence of Western Australia, there is the Queensland Rabbit Proof Fence (also known as the "Darling Downs-Morton Rabbit Board fence"), which is 555 kilometers (345 miles) long. See: http://www.amusingplanet.com/2013/11/dingo-fence-australias-5600km-dog-fence.html ; http://www.fencefence.com/stories/dingo-fence.html ;  https://www.daf.qld.gov.au/plants/weeds-pest-animals-ants/pest-animals/barrier-fences/history-of-the-darling-downs-moreton-rabbit-board-fence ; http://www.rpfcp.com.au/rabbit-proof-fence-history-about/

3 Caliche is a naturally occurring cement, which forms when lime (calcium carbonate) binds various materials (sand, gravel, etc.).  Caliche (also known as hardpan and calcrete) typically forms in arid climates (see: http://www.gly.uga.edu/railsback/VFT/VFTEC.html).

4 Fouquieria splendens (see: https://www.desertmuseum.org/kids/oz/long-fact-sheets/Ocotillo.php).

https://web.archive.org/web/20070714085318/http://www.wbcsd.org/DocRoot/1IBetslPgkEie83rTa0J/cement-action-plan.pdf ; http://www.nrmca.org/sustainability/CONCRETE%20CO2%20FACT%20SHEET%20FEB%202012.pdf ; http://www.nytimes.com/2007/10/26/business/worldbusiness/26cement.html?_r=0

6 https://www.nachi.org/history-of-concrete.htm#ixzz31V47Zuuj ; http://www.concretenetwork.com/concrete-history/

7 https://theconversation.com/the-problem-with-reinforced-concrete-56078 ; see also http://www.cement.org/docs/default-source/th-paving-pdfs/concrete/types-and-causes-of-concrete-deterioration-is536.pdf?sfvrsn=4 ; http://www.rawstory.com/2016/06/the-problem-with-reinforced-concrete/

8 https://electronicintifada.net/content/it-fence-it-wall-no-its-separation-barrier/4715 ; http://america.aljazeera.com/articles/2014/3/12/visual-activism-activestillsphotographsthebarrierwall.htmlhttp://www.haaretz.com/israel-news/.premium-1.707775 ; http://www.eenews.net/stories/1059999621 ;
http://www.theguardian.com/world/ng-interactive/2013/nov/walls#homs ; http://phys.org/news/2010-04-skorea-world-longest-seawall.html ; http://csis.msu.edu/sites/csis.msu.edu/files/Science-2014-Ma-912-4.pdf

9 https://www.washingtonpost.com/news/worldviews/wp/2014/11/11/these-14-walls-continue-to-separate-the-world/ ; see also http://blog.mondediplo.net/2013-11-29-Et-la-frontiere-devint-un-marche-prospere-ethttps://www.washingtonpost.com/politics/trump-on-the-us-mexico-border-building-a-wall-is-easy/2015/07/16/9a619668-2b0c-11e5-bd33-395c05608059_story.html

10 https://www.washingtonpost.com/politics/the-6526-miles-of-fences-in-the-southwest-border/2015/07/17/e4e4e674-2c40-11e5-a5ea-cf74396e59ec_graphic.html ; http://www.globalsecurity.org/security/systems/mexico-wall.htm

11 http://blog.mondediplo.net/2013-11-29-Et-la-frontiere-devint-un-marche-prospere-et ; http://usnews.nbcnews.com/_news/2013/06/21/19062298-price-tag-for-700-miles-of-border-fencing-high-and-hard-to-pin-down ; see also http://www.oxfordamerican.org/magazine/item/558-art-against-the-wallhttp://www.cnbc.com/2015/10/09/this-is-what-trumps-border-wall-could-cost-us.html

12 http://blog.mondediplo.net/2013-11-29-Et-la-frontiere-devint-un-marche-prospere-et ; http://usnews.nbcnews.com/_news/2013/06/21/19062298-price-tag-for-700-miles-of-border-fencing-high-and-hard-to-pin-down

13 http://www.bloomberg.com/news/articles/2010-09-15/idiotic-mexico-border-fence-cost-3-billion-does-nothing-dave-shiflett

14 http://www.zdnet.com/article/boeing-virtual-fence-30-billion-failure/

15 http://www.americanthinker.com/articles/2016/03/the_problem_with_the_wall.html

16 http://work.chron.com/salary-law-enforcement-border-patrol-person-3148.html

17 https://apps.cndls.georgetown.edu/projects/borders/exhibits/show/the-fence/political-implications ; http://www.reuters.com/article/us-usa-election-mexico-idUSKCN0W91WB

18 http://www.newsweek.com/2016/02/26/environmental-impact-us-mexico-border-wall-426310.html ; http://www.huffingtonpost.com/boonsri-dickinson/us-mexican-border-wall-de_b_419208.html

19 http://www.nytimes.com/2013/06/17/us/as-us-plugs-border-in-arizona-crossings-shift-to-south-texas.html ; http://www.azcentral.com/story/news/politics/immigration/2015/08/30/study-tighter-border-brought-az-mexican-migrants/71442296/

20 http://cis.org/seminara/new-pew-report-confirms-visa-overstays-are-driving-increased-illegal-immigration ; http://www.usatoday.com/story/news/2016/01/19/immigration-visa-overstays-department-of-homeland-security-report/79026708/

21 http://www.people-press.org/files/2016/03/3-31-16-March-Political-release-1.pdf
http://www.dallasnews.com/news/politics/headlines/20160628-most-texas-voters-support-donald-trumps-border-wall-and-muslim-ban-poll-says.ece

22 Nieto-Gomez, Rodrigo. 2016, "Walls, Sensors and Drones: Technology and Surveillance on the US-Mexico Border." In Borders, Fences and Walls: State of Insecurity, Elisabeth Vallet, editor, pp. 191-210.  Abingdon-on-Thames: Routledge, p. 204.

23 https://www.whitehouse.gov/interactive-budget

24 http://www.wsj.com/articles/mexican-immigration-to-u-s-reverses-1447954334 ; http://www.pewresearch.org/fact-tank/2016/04/14/mexico-us-border-apprehensions/ ; http://www.pewhispanic.org/2015/11/19/more-mexicans-leaving-than-coming-to-the-u-s/

25 http://www.pewhispanic.org/2015/11/19/more-mexicans-leaving-than-coming-to-the-u-s/


References


http://news.nationalgeographic.com/2016/03/160304-us-mexico-border-fence-wall-photos-immigration/
http://www.globalsecurity.org/security/systems/mexico-wall.htm
http://content.time.com/time/photogallery/0,29307,1814377,00.html
http://map.walls.world/pages/home
http://www.toptenz.net/10-infamous-barrier-walls-throughout-history.php
http://www.history.com/news/history-lists/7-famous-border-walls
http://origins.osu.edu/connecting-history/top-ten-origins-walls
http://www.theguardian.com/world/ng-interactive/2013/nov/walls
https://www.kcet.org/shows/artbound/a-brief-history-of-border-walls
https://www.washingtonpost.com/news/the-fix/wp/2016/02/26/so-how-high-will-donald-trumps-wall-be-an-investigation/
http://www.pbs.org/weta/washingtonweek/blog-post/donald-trump-wants-build-wall-border-mexico-can-he-do-it
http://www.esquire.com/news-politics/a44782/donald-trump-the-wall/
http://www.cement.org/docs/default-source/th-paving-pdfs/concrete/types-and-causes-of-concrete-deterioration-is536.pdf?sfvrsn=4
http://www.rawstory.com/2016/06/the-problem-with-reinforced-concrete/comments/#disqus
https://theconversation.com/the-problem-with-reinforced-concrete-56078
http://10mosttoday.com/10-most-incredible-man-made-barriers/
http://www.zdnet.com/article/boeing-virtual-fence-30-billion-failure/
http://www.bloomberg.com/news/articles/2010-09-15/idiotic-mexico-border-fence-cost-3-billion-does-nothing-dave-shiflett