The National Park Service and the National Park sites have a long history spanning all the way back to the 1800s. The national parks actually outlive the Park service.
Yellowstone became the first national park in the United States. It was designated as a national park in 1872 by President Grant. During the 1800s, parks and landmarks were established and taken care of. In 1916, The National Park Service was established by Congress. Since then, they have been maintaining and protecting all National Park sites. “The job got bigger as the number and types of parks expanded. In the 1930s, military parks and national monuments were added. Then came national parkways and seashores followed by urban parks in the 1960s. During the next decade, the size of the National Park System nearly doubled with the addition of 47 million acres in Alaska.”(nps.gov)