Truth in numbers? Emancipation, race, and federal census statistics in the debates over Black mental health in the United States, 1840–1900

To the keen observer of American political and medical history, a disturbing set of debates surrounded the sanity of free Black residents of the United States of America after the publication of the controversial 1840 census returns on race and insanity. This article analyzes how the census became a battlefield where physicians and other commentators fought over—and thus shaped—various political meanings of Black insanity before and after the American Civil War, up until the 1890s, as the South underwent a massive political and social transformation, from slavery to emancipation. It also highlights the arguments raised by authors such as James McCune Smith and Ramón de la Sagra who attempted to disprove the returns shortly after their publication, and whose arguments contributed to efforts to combat scientific racism.