This article addresses the question of how the United States' policies of antidiscrimination drew on official racial categories that were traditionally used explicitly for discriminatory purposes. After briefly recounting the history of official racial classification practices in the United States and their relation to racist laws and practices, we describe the development of legal prohibitions on racial discrimination, culminating in the civil rights movement of the 1950s, 60s, and 70s. This leads to an examination of how statistical data on race are used to implement civil rights law, before outlining contemporary official racial categories. Finally, we assess the debates that have arisen concerning the collection of racial statistics for...