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
Mount Rushmore the American Indian leader as a response to Mount Rushmore. Upon completion, it will be larger than Mount Rushmore and has the support of Lakota chiefs. The Crazy Horse Memorial Foundation has rejected offers of federal funds, but it is the subject of controversy, even among Indian tribes. Because of its fame as a monument, Mount Rushmore has been depicted in multiple places in popular culture. It is often depicted as a cover for a secret location; shown with faces removed or modified (as in "Superman II"), or added; or parodied. Trey Parker and Matt Stone used the location as