Unless interracial couples absolutely cease to have children, won't we all be exactly the same skin colour (after a very long period of time)?
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I've thought about this before too. My guess is as long a people continue to migrate and procreate faster than evolution, then yes.
I don't think so. I think there will always be societies that want to keep their bloodline "pure". Whether they be racist, in a cult, or just different. Humans always do weird shit like that.