See a pattern? Climatic zones of North America vs. the #AmericanNationspic.twitter.com/xaSjVigWFT
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@KirkegaardEmil Eye-balling maps is incredibly powerful. Someone already beat me to analysis: http://www.pnas.org/content/111/22/7990.full.pdf …
@JayMan471 Yes, but mostly for hypothesis generation. When eye-ballers disagree, numerical analysis must settle it.
@KirkegaardEmil In this instance not much of an issue, since idea is American Nations formed by people. Matter is how they got there.
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