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
Stone Mountain Memorial half dollar founded nearby in 1839; its name would be changed to Stone Mountain by the Georgia Legislature in 1947. From about the time of the American Civil War, the mountain was used as a quarry; this would not entirely cease until the 1970s. John Gutzon de la mothe Borglum (usually called Gutzon Borglum) was born in Idaho Territory in 1867, to one of several wives of a Dane who had converted to Mormonism. As a boy, Borglum lived in various places in the Far West. Turning to art as a career, he attended the San Francisco Art Academy, the Académie Julian,