... tribes have lived on the Columbia River Plateau for over 10,000 years (Tamástslikt). Today many tribal members of the confederation live on the Umatilla Indian Reservation near Pendleton, Oregon. However, prior to the treaty of 1855, these three tribes inhabited 6.4 million acres in Southeastern Washington, Northeastern Oregon and western Idaho. The major rivers of this area are the ... ...

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• Grade Level: High School