White supremacy
White supremacy was dominant in the United States both before and after the American Civil War, and it persisted for decades after the Reconstruction Era. In the antebellum South, this included the holding of African Americans in chattel slavery, in which four million of them were denied freedom. The outbreak of the Civil War saw the desire to uphold white supremacy being cited as a cause for state secession and the formation of the Confederate States of America. In an editorial about Native Americans and the American Indian Wars in 1890, author L. Frank Baum wrote: "The Whites, by law of conquest, by justice of civilization, are masters of the American continent, and the best safety of the frontier settlements will be secured by the total annihilation of the few remaining Indians."