Rapid City, South Dakota City had survived a boom and bust and was establishing itself as an important regional trade center for the upper midwest. Although the Black Hills became a popular tourist destination in the late 1890s, it was a combination of local efforts, the popularity of the automobile, and construction of improved highways that brought tourists to the Black Hills in large numbers after World War I. Gutzon Borglum, already a famous sculptor, began work on Mount Rushmore in 1927 and his son, Lincoln Borglum, continued the carving of the presidents' faces in rock following his father's death in 1941. The work
Gutzon Borglum Rushmore project, 1927–1941, was the brainchild of South Dakota state historian Doane Robinson. His first attempt with the face of Thomas Jefferson was blown up after two years. Dynamite was also used to remove large areas of rock from under Washington's brow. The initial pair of presidents, George Washington and Thomas Jefferson was soon joined by Abraham Lincoln and Theodore Roosevelt. Ivan Houser, father of John Sherrill Houser, was assistant sculptor to Gutzon Borglum in the early years of carving; he began working with Borglum shortly after the inception of the monument and was with Borglum for a total of