In the late spring of 1875, the United States government formed a commission to negotiate with Sioux tribal leaders

In the late spring of 1875, the United States government formed a commission to negotiate with Sioux tribal leaders for the re-acquisition of land in the Black Hills of Dakota that had been granted to the Sioux as part of the Great Sioux Reservation seven years earlier. These negotiations eventually broke down, resulting in the Great Sioux War of 1876. Based only on the textbook, class lectures, and assigned primary sources on Canvas, how did developments between March and June of 1875 influence the US governments negotiating position as reflected in the instructions for the commission drafted in June and delivered in July?