Mount Rushmore still disputed on the basis of the 1868 Treaty of Fort Laramie (see section "Controversy" below). Among American settlers, the peak was known variously as Cougar Mountain, Sugarloaf Mountain, Slaughterhouse Mountain, and Keystone Cliffs. It was named Mount Rushmore during a prospecting expedition by Charles Rushmore, David Swanzey (husband of Carrie Ingalls), and Bill Challis. Historian Doane Robinson conceived the idea for Mount Rushmore in 1923 to promote tourism in South Dakota. In 1924, Robinson persuaded sculptor Gutzon Borglum to travel to the Black Hills region to ensure the carving could be accomplished. Borglum had been involved in sculpting the
Gutzon Borglum and urges strict immigration policies. Borglum was initially involved in the carving of Stone Mountain in Georgia. Borglum's nativist stances made him seem an ideologically sympathetic choice to carve a memorial to heroes of the Confederacy, planned for Stone Mountain, Georgia. In 1915, he was approached by the United Daughters of the Confederacy with a project for sculpting a high bust of General Robert E. Lee on the mountain's rockface. Borglum accepted, but told the committee, "Ladies, a twenty-foot head of Lee on that mountainside would look like a postage stamp on a barn door.'" Borglum's ideas eventually evolved into