Abstract Imprisonment rates for black Americans have long been five to seven times higher than those for whites. The immediate causes are well known: high levels of black imprisonment resulting in part from higher black than white arrest rates for violent crime and vastly higher black drug arrest rates. Drug arrest disparities result from police decisions to concentrate attention on drugs blacks sell and places where they sell them. Prison disparities are aggravated by laws prescribing sentences of unprecedented severity for offenses for which blacks are disproportionately arrested. Those practices and policies were shaped by distinctive sociological, psychological, and political features of American race relations. Work on the psychology of American race relations shows that many white Americans resent efforts made to help black Americans overcome the legacy of racism; that stereotypes of black criminality support whites’ attitudes toward drug and crime control policy; and that statistical discrimination...