How long were pure, African, black people isolated from other races in Africa? How long were pure, White people isolated from other races? | AskHistorians Archive Observer

How long were pure, African, black people isolated from other races in Africa? How long were pure, White people isolated from other races?

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LordHussyPants

You might want to ask this question on /r/AskAnthropology as well, it might do better.