President Bill Clinton designated 19 National Monuments, followed by Theodore Roosevelt with 17, then Jimmy Carter with 15. Jimmy Carter designated by far the most acreage with over 55,800,000 acres, mostly in Alaska.
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During his very active presidency, Theodore Roosevelt established approximately 230 million acres of public lands between 1901 and 1909, including 150 national forests, the first 55 federal bird reservation and game preserves, 5 national parks, and the first 18 national monuments.
Theodore Roosevelt National Park is an American national park of the badlands in western North Dakota comprising three geographically separated areas. Honoring U.S. President Theodore Roosevelt, it is the only American national park named directly after a single person.
The smallest park is Gateway Arch National Park, Missouri, at 192.83 acres (0.7804 km2). The total area protected by national parks is approximately 52.4 million acres (212,000 km2), for an average of 833 thousand acres (3,370 km2) but a median of only 220 thousand acres (890 km2).
But Roosevelt did not create Yellowstone. More than 30 years before his visit, President Ulysses S. Grant signed the Yellowstone National Park Protection Act, establishing the first national park in the world.
The New River Gorge was given National Park Service protection in 1978 as a national river, and was expanded to New River Gorge National Park & Preserve — this country's newest national park — in the plague year of 2020 courtesy of legislation drafted by Senators Joe Manchin and Shelley Moore Capito.
Roosevelt went on to strengthen the protections of public lands, campaigning on conservation for the Vice Presidency in 1900 and later as President, establishing the National Parks system that currently protects not just Yellowstone, but 85 million total acres of American lands.
Sequoia and Kings Canyon National Parks boast many of the world's largest trees by volume. The General Sherman Tree is the largest in the world at 52,508 cubic feet (1,487 cubic meters). The General Grant Tree is the second largest at 46,608 cubic feet (1,320 cubic meters).
National Park of American Samoa: The least-visited US national park in 2022 saw just 1,887 visits. Most visitors will need a passport to travel to American Samoa. 2. Gates of the Arctic National Park and Preserve, Alaska: This vast park contains no roads or trails.