A ranking of the 50 most-murderous cities in 2016 http://econ.st/2nImiJL pic.twitter.com/MfcoiaqBxK
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Those areas had more disease and thus less warfare. Different history, different selective pressures.
The Americas had civilization, but it wasn't stable. It went through boom and bust cycles. Growth, depletion, collapse in 100 years.
Without disease, civilization wasn't stable. Population growth would cause it to collapse within a few generations.
Good point. The history in the Americas does seem to have more of that kind of cycle.
The conquistadors and Iberian peasants were also a rough bunch.
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