Three Affiliated Tribes

Mandan, Hidatsa, and Arikara Nation, also known as the Three Affiliated Tribes, are a Native American group comprising a union of the Mandan, Hidatsa, and Arikara peoples, whose native lands ranged across the Missouri River basin in the Dakotas. As a result of hardship, losses from infectious disease and forced relocations, these three peoples came together in the late 19th century.