What this means is that, in defiance of the law and social convention, an enormous amount of “race-mixing” has long been occurring in the United States, about which we, as a society, have for just as long been in deep denial. I have never given an admixture DNA test of a black person who turned out to be 100 percent African, no matter how dark or “African” they appear to be.

Some of this inter-racial sexuality was voluntary, we now know, but far more was coerced, a reflection or a result of a profound imbalance of power. Because of a confluence of factors — the illegality of miscegenation, the prevalence of sexual abuse and rape as the source of these relationships, infidelity, guilt, shame, and disgrace — both black people and white people had a certain interest in keeping these relationships in the dark, as it were.