The Treaty of 1868 promised this land to the Sioux as long as the buffalo numbers stayed high. Gold was found in the hills, prospectors arrived, and the buffalo population dramatically decreased. Now what was once the holy site Six Grandfathers contains the face of the man who signed the largest mass execution in American history. Interestingly, two acquitted men were among the Dakota 38, including a white man who had been adopted by the Lakota Sioux as a boy. What a wild life story that guy had.