US Government Documents related to Indigenous Nations



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This Executive Order, issued by President Ulysses S. Grant on April 12, 1870, established the Fort Berthold Reservation. In addition to Grant’s Executive Order, this document includes a series of letters, proposals, and endorsements for the creation of a reservation for the Mandan, Hidatsa, and Arikara. Importantly, this document also contains the original map outlining the proposed boundaries and the president’s diagram which significantly reducing the size of the reservation.

Publication Date




Map, diagram, reservation, proposed reservation, executive order, chiefs, Indian village, railroad, Fort Laramie Treaty of 1851, Treaty of Fort Laramie, Agreement at Fort Berthold, Arikaree, Arikara, Sahnish, Hidatsa, Gros Ventre, Mandan, Nueta, Like-a-Fishhook Village

Geographic Subjects

St. Paul, Fort Stevenson, Fort Berthold, Fort Clarke, Fort Rice, Fort Berthold Indian Village, Mouse River, Missouri River, Little Missouri River, Yellowstone River, Heart River, Big Knife River, Little Knife River, Snake River, Powder River, Little Powder River, Black Hills, White Earth River, Township 147, North Dakota, Like-a-Fishhook Village

Organizations Referenced

Mandan Hidatsa and Arikara Nation, MHA Nation, the Three Affiliated Tribes, the Three Affiliated Tribes of the Fort Berthold Reservation, US government, US Department of the Interior, US Office of Indian Affairs, US Army, Military Division of the Missouri, Department of Dakota, Adjutant General’s Office, Twenty-Second US Infantry, Northern Pacific Railroad

People Referenced

Ulysses S. Grant, Philip Sheridan, E.D. Townsend, Edward D. Townsend, S.A. Wainwright, Samuel A. Wainwright, Ely S. Parker, George L. Hartsuff, Winfield S Hancock, Philip Sheridan, J.D. Cox, Jacob D. Cox, O.D. Greene


American Politics | Indigenous, Indian, and Aboriginal Law | Indigenous Studies | Law and Politics | Military History | Native American Studies | Political History | United States History


The reference to the Treaty of Oct. 1st 1861, in the proposed diagram for the "Reservation of Gros Vetres, Arickarees, & Mandans," is a mistake, as there is no record of such a treaty. Based off the map, it was likely that he was referring to the Fort Laramie Treaty of 1851.

Executive Order of 1870



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