@jeansordenim was normal in the US until yesterdaypic.twitter.com/3NUP4cw4Kq
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@jeansordenim possible - 51% live in cities in 1920, weird if that was a tipping point. fertility transition occurs generations earlier
@jeansordenim (in other words 51% lived in cities but 85% of old people still lived with children - then whoosh)
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