It’s Earth Day, and every state has some earth set aside as public land. The federal government owns the lion’s share of public lands, most of which are in the West. Alaska has the most: Just over 89% of its land is owned by the state or federal government. Thirty states have at least one national park, as do American Samoa, the U.S. Virgin Islands and Puerto Rico. Yellowstone was the first national park, founded in 1872, but California had set aside Yosemite 26 years earlier. The federal government took it over later when it created other national parks in the state.
Source: https://www.nrcm.org/documents/publiclandownership.pdf