NEGROES AMERICAN INDIANS WHITE SETTLERS ENDOGAMY VERSUS MIXING AND DAVID REICH

Let's just put polite discussion of this butt ugly racial PIG'S BREAKFAST history off, until tomorrow, shall we?

Many negroes thought they were mulattoes because they must have mixed with Indians. That turned out not to be true at all, in fact the opposite, almost no mixing. 

White colonists, then later American citizens, the only citizens then showing, on the other hand, turned out to be the cause of mulattoism in negro slave populations.

They did a North Eurasian dick move on their slave women, perfectly legal, if not moral, like the white West Eurasians did on conquered and enslaved ANI dark Indian women. See David Reich, ch 6.