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
St. Charles, Idaho Charles and the rest of the northern Bear Lake Valley settlements in Oneida County, Idaho Territory. Sculptor Gutzon Borglum (1867–1941) was born in St. Charles. St. Charles is located at (42.112493, -111.390001), at an elevation of above sea level. According to the United States Census Bureau, the city has a total area of , all of it land. As of the census of 2010, there were 131 people, 53 households, and 35 families residing in the city. The population density was . There were 138 housing units at an average density of . The racial makeup of the city was