@adamkotsko @mattyglesias Not actually true, common misconception http://bit.ly/Zhxaan .
@St_Rev @simplic10 > irrigation system. But, hmm, wiki attributes this to climate change circa 1400, pre-contact. Never mind!
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@Meaningness@st_rev I'm glad you guys reminded me of this stuff, I read it in Diamond but had half-forgotten it. -
@simplic10@Meaningness I wonder what the indigenous population of modern N. America is by descent weighting? There's huge admixture. - 2 more replies
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@Meaningness@simplic10 N. American west is our central Asia, pop. density never going to be that high. But east, midwest, west coast...Thanks. Twitter will use this to make your timeline better. UndoUndo
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