" What few people seemed to realize or perhaps dared admit was that the thick walls of the caste system kept everyone in prison. The rules that defined a group’s supremacy were so tightly wound as to put pressure on everyone trying to stay within the narrow confines of acceptability. It meant being a certain kind of Protestant, holding a particular occupation, having a respectable level of wealth or the appearance of it, and drawing the patronizingly appropriate lines between oneself and those of lower rank of either race in that world. "
― Isabel Wilkerson , The Warmth of Other Suns: the Epic Story of America's Great Migration