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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Replying to @jaspergregory
Why did North Central Eurasia produce so many human expansions? Probably because it's a good place to get away from.
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Replying to @Steve_Sailer @jaspergregory
But isn't the deeper point that it created humans capable of expanding across (and often conquering/replacing) the other humans next to them?
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It's a giant selective filter for tribal cohesion - if your tribe falls behind the neighbors, they conquer you and take your women. Next generation has a higher baseline. Repeat until one group dominates and raids beyond the region. When cohesion breaks down, goto 1.
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Replying to @CovfefeAnon @17cShyteposter and
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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Precisely
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