thumb|upright 1.3|De Smet map of the 1851 Fort Laramie Indian territories (the light area). Jesuit missionary De Smet drew this map with the tribal borders agreed upon at Fort Laramie in 1851. Although the map itself is wrong in certain ways, it has the Crow territory west of the Sioux territory as written in the treaty, and the Bighorn area as the heart of the Crow country.
