How could nomadic, semi-nomadic, and/or migrating peoples literally pillage so many areas in western Eurasia that civilization retreats to the Mediterranean and Mesopotamia, or less?
Or how could a similar situation happen in India or China?
If not possible anywhere in the Old World, could raiders from the north destroy the civilizations of Mesoamerica?
Or how could a similar situation happen in India or China?
If not possible anywhere in the Old World, could raiders from the north destroy the civilizations of Mesoamerica?
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