The US Department of Interior controls the National Park Service. Park rangers and lower level employees do a lot of the physical labor to maintain trails and keep park guests safe.
A number of the original National Park trails and buildings were made by the Civilian Conservation Corps, a government employment program from the New Deal in response to high unemployment during the Great Depression.
State parks have their own Departments of Natural Resources, but also rely on volunteer trail workers to help maintain all of the trails.
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