The tribal headquarters is in New Town, the 18th largest city in North Dakota.Ĭreated in 1870, the reservation is a small part of the lands originally reserved to the tribes by the Fort Laramie Treaty of 1851, which allocated nearly 12 million acres (49,000 km²) in North Dakota, South Dakota, Montana, Nebraska and Wyoming. The reservation includes lands on both sides of the Missouri River. Indian reservation in western North Dakota that is home for the federally recognized Mandan, Hidatsa, and Arikara Nation, also known as the Three Affiliated Tribes. The Fort Berthold Indian Reservation is a U.S.
