Three Affiliated Tribes Of North Dakota

The Mandan, Hidatsa, and Arikara Nation (MHA Nation), also known as the Three Affiliated Tribes (Mandan: Miiti Naamni; Hidatsa: Awadi Aguraawi; Arikara: ačitaanu' táWIt), is a federally recognized Native American Nation resulting from the alliance of the Mandan, Hidatsa, and Arikara peoples, whose Indigenous lands ranged across the Missouri River basin extending from present day North Dakota through western Montana and Wyoming. After the signing of the Fort Laramie Treaty (1851) and subsequent seizure of land, the Nation's land base is currently approximately 1 million acres located in Fort Berthold Reservation in northwestern North Dakota. via Wikipedia ↗