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The conflict between nomadic and agricultural people had been a recurring phenomenon throughout world history.Recent study finds dynastic cycles as an important determinant of nomadic conquests in the context of Sino-nomadic conflict, where an aging Chinese dynasty was more likely to be conquered.This paper extends this result in two dimensions by using a sample of nomads in or near China and a sample from world history.The effect of dynastic cycles on nomadic conquests remain significant in a much broader context.Overall, dynastic cycles appear to be a general force shaping world history that has been hitherto underappreciated.