Mandan, Hidatsa, and Arikara Nation Also known as the Three Affiliated Tribes, this Indian Nation is comprised of the
Mandan,
Hidatsa, and Arikara peoples, whose native lands once 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. Today, the nation is based at the
Fort Berthold Reservation in
North Dakota. The Tribe consists of about 13,000 enrolled members. Nearly 4,500 live on the reservation; others live and work elsewhere.
