Ownership of the Black Hills

The Sioux moved into the Black Hills area in 1765 after getting beat in battle and displaced from Minnesota by the Ojibway. So, they held the Black Hills area for a little over 100 years. The original residents were the Arikaree and many other indigenous tribes (including the Cheyenne), before the Sioux displaced them. Ownership in any land is temporary and fleeting, any any claims to eternal ownership are folly.