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In page Appalachian Trail:

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In the 1960s, the ATC made progress toward protecting the trail from development, thanks to efforts of politicians and officials. Wisconsin senator Gaylord Nelson offered legislation to protect the route.[28] The National Trails System Act of 1968 designated the Pacific Crest Trail and Appalachian Trail as the first national scenic trails[29] and paved the way for a series of such trails within the national park and national forest systems.[30] Trail volunteers worked with the National Park Service to map a permanent route for the trail, and by 1971 a permanent route had been marked (though minor changes continue to this day). By the close of the 20th century, the Park Service had completed the purchase of all but a few miles of the trail's span.[citation needed]