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 years and thus be one of the longest-lasting human artifacts. Because of this enduring structure, it has appeared in some science fiction set in the distant future: In addition to in "Pilotwings 64", Mount Rushmore also appears: American composer Michael Daugherty's 2010 piece for chorus and orchestra, "Mount Rushmore," depicts each of the four presidents in separate movements. The piece sets texts by George Washington, William Billings, Thomas Jefferson, Maria Cosway, Theodore Roosevelt, and Abraham Lincoln. Alice Cooper references Mount Rushmore in his album DaDa on the song "I love America" with the words, "I love that mountain with those