“A third layer of nativeness was composed of those whom others thought directly descended, even the tiniest fraction of their genes, from the human beings who had been brought from Africa centuries ago as slaves. While this layer of nativeness was not vast in proportion of the rest, it had vast importance, for society had been shaped in reaction to it. An unspeakable violence had occurred in relation to it, and yet it endured, fertile, a stratum of soil that perhaps made possible all future transplanted soils.”