What are the three benefits of the national park system?
Parks and public lands serve an essential role in preserving natural resources and wildlife habitats, protecting clean water and clean air, and providing open space for current and future generations.
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The big 3 national parks: Yellowstone, Yosemite and Grand Canyon.
A bill creating the first national park, Yellowstone, was signed into law by President Ulysses S. Grant in 1872, followed by Mackinac National Park in 1875 (decommissioned in 1895), and then Rock Creek Park (later merged into National Capital Parks), Sequoia and Yosemite in 1890.