In 1868, the Treaty of Fort Laramie was signed, which "guaranteed" the use of the Black Hills, Powder River Country and other regions surrounding the northern Missouri River to Native Americans without white intervention.
En 1868, asinouse o tratado de Fort Laramie, que "garantía" o uso das Black Hills (Outeiros Negros), do Powder River Country (territorio do río Powder) e outras rexións que rodean o norte do río Missouri para os nativos americanos sen intervención branca.