The Dakota's MHA Nation: Three Affiliated Tribes
- According to the Fort Laramie Treaty of 1851, the territorial lands of the Three Tribes was an area of more than 12 million acres, extending from east of the Missouri River into Montana. In the following years, to justify taking more land, the Federal Government, through several allotment acts and the Homestead Act, reduced the reservation further to less than 3 million acres. The flooding of the prime river bottomland was yet another assault on the autonomy and cultures of the Mandan, Hidatsa and Sahnish. Flooding the reservation bottomlands reduced the reservation even further, leaving approximately 1 million acres of individual and tribally owned lands.