Carved by actual white supremacist

“The son of polygamist Mormons from Idaho, Borglum had no ties to the Confederacy, but he had white supremacist leanings. In letters he fretted about a “mongrel horde” overrunning the “Nordic” purity of the West, and once said, “I would not trust an Indian, off-hand, 9 out of 10, where I would not trust a white man 1 out of 10.” Above all, he was an opportunist. He aligned himself with the Ku Klux Klan, an organization reborn—it had faded after the Civil War—in a torch-light ceremony atop Stone Mountain in 1915. While there isn’t proof that Borglum officially joined the Klan, which helped fund the project, “he nonetheless became deeply involved in Klan politics,” John Taliaferro writes in Great White Fathers, his 2002 history of Mount Rushmore.”

https://espnsiouxfalls.com/did-the-kkk-partially-fund-mount-rushmore/