The 1863 Nez Perce Treaty was an agreement made between the U.S. government and the Nez Perce tribe, which significantly reduced their land and altered their way of life. This treaty is notable for its contentious nature, as it was signed under pressure and later repudiated by many tribal leaders. The Nez Perce people, who originally inhabited a large region of the Pacific Northwest, found their territory drastically diminished due to this treaty.