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The point is that there are no races in the sense people talk about them colloquially. Phenotypical 'race' doesn't match genetic makeup well enough to serve as a reliable indicator of anything.

Nationalities like Chinese have even less to do with genetic makeup, and Africa is a whole continent, so talking about African countries as a whole is pretty much nonsense unless you're referring to their geographical location on the same continent.

There really are lots of strong correlations between race and measurable qualities. That alone means it's a real concept - it has predictive power. Simple examples are hair color and eye coolor.

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