
Commentary: CTUIR celebrates 170th anniversary of the Treaty of 1855
June 9, 2025, marks the 170th anniversary of the Treaty of 1855 between the U.S. government and the Cayuse, Walla Walla and Umatilla Tribes, which are now known as the Confederated Tribes of the Umatilla Indian Reservation (CTUIR). Through this 170-year- …