Final answer:
The National Park Service is the agency responsible for supervising and managing campgrounds, providing recreational opportunities, and conserving land and wildlife.
Explanation:
The agency directly related to supervising and managing campgrounds is the National Park Service. The National Park Service manages more than 380 parks, recreation areas, seashores, trails, monuments, memorials, battlefields, and historic sites, providing recreational opportunities for visitors.
The National Park Service is part of the Department of the Interior and is focused on conserving land and wildlife while also offering recreational facilities for visitors to enjoy the natural beauty and heritage of the United States.
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