This area was historically occupied by the Potawatomi people, one of the tribes in the Council of Three Fires. Typically they lived in highly decentralized bands. Treaties signed by some leaders with United States representatives ceded large areas of their territory to the US. Starting in 1794, Native American titles to Indiana lands were extinguished by usurpation, purchase, or war and treaty. The United States acquired land from the Native Americans in the 1809 treaty of Fort Wayne, by the treaty of St. Mary's in 1818, and in 1826 by the Treaty of Mississinewas, which included the future Steuben County.