I discovered, while working on The Warmth of Other Suns, that I was not writing about geography and relocation, but about the American caste system, … - Isabel Wilkerson

While the Nazis praised “the American commitment to legislating racial purity,” they could not abide “the unforgiving hardness” under which “ ‘an American man or woman who has even a drop of Negro blood in their veins’ counted as blacks,” Whitman wrote. “The one-drop rule was too harsh for the Nazis.

As a means of assigning value to entire swaths of humankind, caste guides each of us often beyond the reaches of our awareness. It embeds into our bones an unconscious ranking of human characteristics and sets forth the rules, expectations, and stereotypes that have been used to justify brutalities against entire groups within our species. In the American caste system, the signal of rank is what we call race, the division of humans on the basis of their appearance. In America, race is the primary tool and the visible decoy, the front man, for caste.

Ida Mae Gladney, Robert Foster, and George Starling each left different parts of the South during different decades for different reasons and with different outcomes. The three of them would find some measure of happiness, not because their children had been perfect, their own lives without heartache, or because the North had been particularly welcoming. In fact, not a single one of those things had turned out to be true. There had been sickness, disappointment, premature and unexpected losses, and, among their children, more divorces than enduring marriages, but at least the children had tried. The three who had come out of the South were left widowed but solvent, and each found some measure of satisfaction because whatever had happened to them, however things had unfolded, it had been of their own choosing, and they could take comfort in that. They believed with all that was in them that they were better off for having made the Migration, that they may have made many mistakes in their lives, but leaving the South had not been one of them.