In August 1862 the Sioux of Minnesota rose up against their white neighbors in the bloodiest massacre in the history of the West, with four times the fatalities of the Battle of Little Big Horn. They had been viewed by white settlers as a friendly tribe, but in reality they were deeply resentful over the loss of lands, the disappearance of the buffalo, broken treaties, the government's delayed annuity payments, and the refusal of traders to release...