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As a black person of African descent, I feel confident in saying that the group called homo sapiens, of which I and all of my ancestors for millennia am a part, expanded out of Africa into new environments.

"our" refers to homo sapiens. Even if she weren't, many (most?) Africans probably have ancestors who were not born in Africa at some point.

I don't think this topic can be discussed without people getting touchy. Best avoided in my opinion.