A Piegan Indian encampment in North America. Tipis, including a decorated medicine tipi. Taken in 1900 by Edward S. Curtis (1868-1952). The Piegan are an Algonquian people from the North American Great Plains. They were the largest of three Blackfoot-speaking groups that made up the Blackfoot Confederacy with the Siksika and the Kainai, and dominated much of the northern plains during the nineteenth century. In the nineteenth century after their homelands were divided between Canada and the United States of America, the Piegan people were forced to sign treaties with one of those two countries, settle in reservations on one side or the other of the border, and be enrolled in one of two government-like bodies sanctioned by North American nation-states. Today many Piegan live on the Blackfeet Reservation in northwestern Montana.