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by mikeash 3447 days ago
There are some real characteristics shared by some members of those large groups. Certainly not all of them, considering the arbitrary rules. 10% of American "blacks" have majority white ancestry. Are you telling me that they still have all of the real characteristics shared by others of the "black" group?

This stuff does not line up neatly. To the extent that there are genetic differences between groups of humans, the dividing lines don't match our concepts of race.