What was the purpose of the fort laramie treaty with the sioux?

The Treaty of Fort Laramie (also called the Sioux Treaty of 1868) was an agreement between the United States and the Oglala, Miniconjou, and Brulé bands of Lakota people, Yanktonai Dakota and Arapaho Nation signed on April 29, 1868 at Fort Laramie in the Wyoming Territory, guaranteeing the Lakota ownership of the Black