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Come on, blacks? Persian jews and Yemenites went south to sub-Saharan Africa and became the "Shirazi" (which Obama probably descends from since he's Kenyan) and Lemba people.
Obviously American Indians are a better example (the more isolated tribes, not mutts like the Cherokee etc.) Some English people don't even descend from royalty at all, and are practically completely English. Ditto for Scandinavia. Obviously you're not going to see a bunch of jewish mixture in eastern Finns and Karelians.