At the height of the Great Migration and the Progressive era, interracial sex districts began to appear in the urban American landscape. Interzones weaves the growth of cities and the development of commercialized leisure into an account of how the sexual color line was drawn - and how it was crossed. From black female prostitution to homosexual couples, from taxi dance halls to speakeasies, Kevin J. Mumford reconstructs the mixed-race underworld to reveal how these subcultures transformed not only race relations, but American culture as well.