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Image: Yosemite National Park - Valley View
Yosemite National Park - Valley ViewSubmitted by Harlan Goodson / UGC

The correct answer is:  With the help of conservationist John Muir, Yosemite was designated a national park on October 1, 1890, making it the country's third-oldest park. The first national park was Yellowstone in Wyoming, designated in 1872.