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That would not have an affect on human evolution. The time period was too short, too recent, and that was a series of independent local events.

Further, wars were almost always between regional neighbors then as well.

I'm not convinced. The black death had an effect on human evolution -- a single event with high mortality can be all it takes to shift the genome.

But that is directly due to the level of death. We have no evidence that half of the tribes in an area were wiped out.