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Anthropologists mapped the eight centuries of high birth rates that preceded the collapse of societies in the American Southwest in 1300 A.D. “It was a trap,” said the study’s lead author. “A Malthusian trap but also a violence trap.”

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Anthropologists mapped the eight centuries of high birth rates that preceded the collapse of societies in the American Southwest in 1300 a.d. “It was a trap,” said the study’s lead author. “A Malthusian trap but also a violence trap.”

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