Samuel Forster Tappan was an American journalist, military officer, abolitionist and a Native American rights activist. Appointed as a member of the Indian Peace Commission in 1867 to reach peace with the Plains Indians, he advocated self-determination for native tribes. He proposed the federal government replace military jurisdiction over tribal matters with a form of civil law on reservations, applied by the tribes themselves.

The Indian Peace Commission was a group formed by an act of Congress on July 20, 1867 "to establish peace with certain hostile Indian tribes." It was composed of four civilians and three, later four, military leaders. Throughout 1867 and 1868, they negotiated with a number of tribes, including the Comanche, Kiowa, Arapaho, Kiowa-Apache, Cheyenne, Lakota, Navajo, Snake, Sioux, and Bannock. The treaties that resulted were designed to move the tribes to reservations, to "civilize" and assimilate these native peoples, and transition their societies from a nomadic to an agricultural existence.