Mandan Hidatsa Arikara Tribe Flag

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. Hardship, losses from infectious disease and forced relocations brought the remnants of the peoples together in the late 19th century.