Not so long ago, nearly all African-Americans living in the United States were subject to a multitude of racial restrictions officially prescribed and enforced by state governments and their local subsidiaries. Most of the Jim Crow system dated from 1890–1910. By the middle of the twentieth century, this system was well established, so much so that many people assumed that it had always existed and that it expressed the timeless folkways of the South. However, in what strikes the historian as an astonishingly brief period during the 1950s and 1960s, the edifice was largely torn down. The puzzle is this: How could any institutional apparatus so deeply embedded, long-standing, and apparently strong be toppled so quickly? Although many scholars have discussed aspects of the puzzle, no one has offered a simple, clear, and compelling explanation. We aim to do so in this essay.