This is interesting, in part, because North Central Eurasia produced so many Human expansions: East Asians, Native Americans and the Yamnaya's of West Eurasiahttps://twitter.com/mazzenilsson/status/1162810880024883200 …
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Cohesion breaks down because when the group conquers places where it's economically beneficial to have settlements they then rule settled areas and are subject to the same selective filters that settled rulers are
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