Beginning with Yellowstone, the idea of a national park was an American invention of historic consequences. The areas that now comprise the national park system, and those that will be added in years to come, are cumulative expressions of a single national heritage. The National Park Service must manage park resources and values in such manner and by such means as will leave them unimpaired for the enjoyment of future generations -- 2001 NPS Management Policies.
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Last updated: August 9, 2015