@Peter_Turchin I wrote this before I read your book -http://www.spectator.co.uk/2012/06/divided-we-stand/ …
Replying to @rorysutherland
@rorysutherland big summary post on the hajnal line https://hbdchick.wordpress.com/2014/03/10/big-summary-post-on-the-hajnal-line/ … (^_^)
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