It is the purpose of this subchapter to facilitate protection and provide interpretation of sites in the Nez Perce country of Idaho and in the States of Oregon, Washington, Montana, and Wyoming that have exceptional value in commemorating the history of the Nation.
(Pub. L. 89–19, § 1, May 15, 1965, 79 Stat. 110; Pub. L. 102–576, § 2(1), Oct. 30, 1992, 106 Stat. 4770.)