In 1908, American philosopher Josiah Royce foresaw the future. Race questions and prejudices, he said, "promise to become, in the near future, still more important than they have ever been before." Like his student W. E. B. Du Bois in Souls of Black Folk (1903), Royce recognized that the problem of the next century would be, as Du Bois put it, "the problem of the color line." The twentieth century saw vast changes in race relations, but even after...