Today is the 100th anniversary of the passage of the Weeks Act, which permitted the federal government to purchase private land, protecting forests and watersheds in the Eastern United States. The act has been called one of the most successful pieces of conservation legislation in the nation’s history. It safeguards habitats for hundreds of species, and recreation space for millions, including miles of the Appalachian Trail. The trail meanders through twelve states and thousands of acres of federally conserved land. It also passes through privately-owned and locally controlled land, leaving it vulnerable to threats of encroachment.