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
Solon Borglum group of the sculptor's descendants gave twenty bronzes, marbles, original plasters, portfolios of drawings and paintings to the New Britain Museum of American Art. Today the Museum houses the largest repository of Borglum's works. Borglum sculpted a larger than life bronze equestrian statue for the "Bucky O'Neill Monument, Rough Rider" at the Yavapai County Court House Plaza in Prescott, Arizona. Teddy Roosevelt had persuaded Buckey O'Neill to join the Rough Riders and he was killed at the Battle of San Juan Hill. Borglum's statue "Cowboy at Rest" is also located on the grounds of the Yavapai County Court House in