It's strange to consider that the U.S. has not had a "National Park" inscription in 27 years. The controversies primarily in the early/mid-90's
(many highlighted in this forum previously) have had an enormous effect on the United States not seeking additional National Park inscriptions. Before another National Park is inscribed it will undoubtedly be a 3-decade gap
(or more), since we know the upcoming U.S. nominations up until 2025. Just over 1/5 of the 64 U.S. National Parks are UNESCO World Heritage Sites
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The First Ten American National Parks on the UNESCO World Heritage List (1978-1987)
Mesa Verde National Park (1978) 4.14
Yellowstone National Park (1978) 4.81
Grand Canyon National Park (1979) 4.58
Everglades National Park (1979) 3.64
Redwood National and State Parks (1980) 4.13
Mammoth Cave National Park (1981) 3.20
Olympic National Park (1981) 4.04
Great Smoky Mountains National Park (1983) 3.30
Yosemite National Park (1984) 4.28
Hawaii Volcanoes National Park (1987) 4.24
*Kluane / Wrangell-St. Elias / Glacier Bay / Tatshenshini-Alsek was inscribed in 1979 albeit under a different name and boundaries. Both U.S. components Wrangell-St. Elias and Glacier Bay were actually National Monuments in 1979 and were designated as National Parks in 1980.*Haleakalā National Park was removed from the U.S. Tentative List in 1983►
1990's - 2000's [Decline of Nominations and U.S. hiatus from UNESCO]
Carlsbad Caverns National Park (1995) 3.44
Waterton Glacier International Peace Park (1995) 4.03
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National Parks, Former TWHS (National Parks Removed from Tentative List in 1996)Acadia National Park (Maine)
Arches National Park (Utah)
*listed by users as Top Missing in 2020Bryce Canyon National Park (Utah)
Canyonlands National Park (Utah)
Capitol Reef National Park (Utah)
Crater Lake National Park (Oregon)
Death Valley National Park (California)
*listed by users as Top Missing in 2014Grand Teton National Park (Wyoming)
Guadalupe Mountains National Park (Texas)
Joshua Tree National Park (California)
*listed by users as Top Missing in 2020 as serial property with Death ValleyMount Rainier National Park (Washington)
North Cascades National Park (Washington)
Rocky Mountains National Park (Colorado)
Saguaro National Park (Arizona)
Sequoia/King Canyon National Parks (California)
*listed by users as Top Missing in 2020Zion National Park (Utah)
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National Parks, Former TWHS (National Parks Removed from Tentative List in 2008)Denali National Park (Alaska)
Gates of the Arctic National Park (Alaska)
Katmai National Park (Alaska)
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2008 - 2017 (Increased Engagement with UNESCO: Updated Tentative Lists)- Petrified Forest National Park (nominated 2008)
*100% community rating based off 10 votes- White Sands National Park (nominated 2008)
*88% community rating based off 8 votes- Big Bend National Park (nominated 2017)
*100% community rating based off 4 votes