In 1838 the United States forced the Seneca to agree to the Treaty of Buffalo Creek, which was part of the Indian Removal policy initiated by the President Andrew Jackson administration. It required the Seneca of western New York to cede all their reservation lands and move west of the Mississippi River, specifically to Wisconsin and Indian Territory (present-day Oklahoma), within five years. After the land sale that required the treaty fell through, the US negotiated a new treaty, which the Senate ratified in 1842. The Seneca began selling portions of the reservation in the 1840s to European Americans, members of the Ebenezer Society.