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 His father, Jens Møller Haugaard Børglum (1839–1909), had two wives when he lived in Idaho: Gutzon's mother, Christina Mikkelsen Borglum (1847–1871) and Gutzon's mother's sister Ida, who was Jens's first wife. Jens Borglum decided to leave Mormonism and moved to Omaha, Nebraska where polygamy was both illegal and taboo. Jens Borglum worked mainly as a woodcarver before leaving Idaho to attend the Saint Louis Homeopathic Medical College in Saint Louis, Missouri. At that point "Jens and Christina divorced, the family left the Mormon church, and Jens, Ida, their children, and Christina's two sons, Gutzon and Solon, moved to St. Louis,