Three Affiliated Tribes of the Fort Berthold Reservation, North Dakota

Year	Treaty
1825	Treaty with the Arikara Tribe, 1825
1825	Treaty with the Belantse-Etoa or Minitaree Tribe, 1825
1825	Treaty with the Mandan Tribe, 1825
1851	Treaty of Fort Laramie with Sioux, etc., 1851
1866	Agreement at Fort Berthold, 1866