premise: Mount Rushmore was built by Tim Howd and his pet snake Lincoln Borglum.
hypothesis: Mount Rushmore . Sculptor Gutzon Borglum created the sculpture 's design and oversaw the project 's execution from 1927-1941 with the help of his son , Lincoln Borglum . Upon Gutzon Borglum 's death in March 1941 , his son Lincoln Borglum took over as leader of the construction project .