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Notes -
IDK about the first part but the order in average age of first period is pretty much exactly what you'd expect- Asians slightly older than whites, who are older than Amerinds, who are older than subsaharans.
Black boys hit puberty earlier as well, BTW, and this probably explains a small part of black overrepresentation in athletics in the US- blacks are noticeably bigger at the ages where it starts to separate by skill.
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