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 exhibiting in Europe. Borglum was trained in Paris at the Académie Julian, where he came to know Auguste Rodin and was influenced by Rodin's impressionistic light-catching surfaces. Borglum's works were accepted to the 1891 and the 1892 Paris Salons. In Paris, Elizabeth studied with Felix Hildago. Elizabeth took part in the 1892 Columbus Centennial Exhibition in Spain. A return trip to California proved to be ill-timed, as the state was in the throes of a financial depression. In 1893, they purchased a home, "El Rosario", in Sierra Madre, California. In 1896 Gutzon and Elizabeth went back to Europe, this