The United States has 61 protected areas known as national parks that are operated by the National Park Service, an agency of the Department of the Interior. An act of the United States Congress must establish national parks. 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, and then Rock Creek Park, Sequoia and Yosemite in 1890.
Read more: List of 61 National Parks of the United States Activities, Information, and Resources
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