There's something geographic happening here. Seems to correlate w/ flat areas of land on US map btwn. Mississippi river & rocky mtn. range.https://twitter.com/EmmieMears/status/798167709204840448 …
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out of Appalachia into Great Plains states in ~1940s. Seems to explain a lot; plan to follow up
Given high birth rate among ex-Appalacians, is at least partial explanation for fall of blue wall
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