North-west Europe. The Seine Basin, the Low countries, and England primarily. Scandinavia and (iirc) Scotland had stem families. Ireland and most of the rest of

North-west Europe. The Seine Basin, the Low countries, and England primarily. Scandinavia and (iirc) Scotland had stem families. Ireland and most of the rest of Europe, including Bohemia, had something closer to the communitarian type, so famines there are unsurprising. If Emmanuel Todd is to be believed, on this, his primary area of expertise. Like Noam Chomsky he branched out into other topics later. Of course there were other regulators in China. Female infanticide was a primary one. Sex ratio imbalances also cause trouble though.