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 in popular culture the final battle with the Forever King. Another group shown as having a secret base inside the mountain is the "All Purpose Enforcement Squad" of "Young Justice", in the DC Universe series. The comic book superhero Mister Majestic, a character in the Wildstorm Productions universe, also had a secret base of operations inside Mount Rushmore, analogous to Superman's "Fortress of Solitude". In "", a 1981 animated movie jointly produced by Hanna-Barbera and Tsuburaya Productions, the heroic Ultra Force is headquartered within Mount Rushmore. Mount Rushmore was a primary location of interest in the plot of the 2007 film "" starring