From the record
“The Nez Perce National Historical Park is a United States National Historical Park comprising 38 sites located across the states of Idaho, Montana, Oregon, and Washington, which include traditional aboriginal lands of the Nez Perce people. The sites are strongly associated with the resistance of Chief Joseph and his band, who in June 1877 migrated from Oregon in an attempt to reach freedom in Canada and avoid being forced on to a reservation.”
Wikipedia article Nez Perce National Historical Park, CC BY-SA 4.0.
One of 8 National Register listings published here for Clearwater County · listed in 1966 · category: District · built in 1965.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service