The Mississippi, Pillager, and Lake Winnibigoshish bands of Ojibwe sign a treaty with the US government that consolidates and expands the Cass Lake, Lake Winnibigoshish, and Leech Lake Reservations into the Leech Lake Indian Reservation in north-central Minnesota. The treaty, which would be renegotiated in 1864, requires numerous Ojibwe living elsewhere in the state to move to Leech Lake.