The nation’s newest National Park, the New River Gorge National Park & Preserve in West Virginia, was upgraded from a National River in 2021.
https://www.cnn.com/travel/article/new-river-gorge-west-virginia-newest-national-park/index.html
That brings the current total of National Parks to 63 and 423 National Park Units and counting. You can see a list at: https://parksexpert.com/all-us-national-parks-list/
The only state without a National Park Unit is Delaware.
The Great Smoky Mountains is the most visited park and the Gates of the Arctic is the least visited.
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I went to college in Virginia which is where I got to know a less scenic New River. It is one.of the few rivers that flows north into the Ohio, if I remember correctly.