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Razib Khan
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There is a border across which fertility drops by a factor of two in North America (defined as from Canada to Panama). Specifically, one nation has a TFR of ~4, and the other ~2. Can you guess the two nations? You can find the answer in the charts below.

First, linear:

Now, log-transformed:

That’s right, TFR, Guatemala (4.15) → Mexico (2.21) → United States (2.05) → Canada (1.53)

(source, 2005-2010 estimates)

Here’s GDP PPP per capita:

United States ($46,400) → Canada ($38,000) → Mexico ($13,600) → Guatemala ($4,800)

This is why the Mexican-Guatemalan border experiences a great deal of traffic.

Razib Khan
About Razib Khan

"I have degrees in biology and biochemistry, a passion for genetics, history, and philosophy, and shrimp is my favorite food. If you want to know more, see the links at"