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 a high-relief frieze of Lee, Jefferson Davis, and 'Stonewall' Jackson riding around the mountain, followed by a legion of artillery troops. Borglum agreed to include a Ku Klux Klan altar in his plans for the memorial to acknowledge a request of Helen Plane in 1915, who wrote to him: "I feel it is due to the KKK that saved us from Negro domination and carpetbag rule, that it be immortalized on Stone Mountain". After a delay caused by World War I, Borglum and the newly chartered Stone Mountain Confederate Monumental Association set to work on this unexampled monument, the size