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The U.S. National Park Service (NPS) manages almost four hundred national park units, including national parks, national monuments, national preserves, national battlefields, and national historic sites. These units preserve distinctive natural, cultural and historic resources of national interest. The national parks and large national monuments are found disproportionately in Alaska and the West, while battlefields are more common in the East, and historic sites are dotted throughout the country.
Although Yellowstone was designated the world's first national park in 1872, the NPS was only established in 1916, [Page 489]by the National Park Service Organic Act. Nine other national parks also predate the NPS, originally managed in ad hoc ways under the U.S. Department of Interior.Yellowstone National Park, Ranger Naturalist Service
The Organic Act mandated the NPS “to ...