The Yakama Nation is an American Indian tribe in Washington, located on the Yakama Indian Reservation, on the east side of the Cascade Mountains. In 1855, the tribe signed the Yakama Nation Treaty of 1855, ceding approximately 10,000,000 acres to the United States, but reserving important rights for the tribe and its members. In the treaty, the tribe reserved “the right, in common with citizens of the United States, to travel upon all public highways.”