I guess the US doesn't have that much for UNESCO sites but I'm pretty sure that's still bad news for international tourism to the US.
UNESCO World Heritage Sites is just one aspect of the UNESCO operation, although for the ordinary man (or woman) in the street, probably the most recognisable.
Unfortunately for the USA, the dice are loaded.
This became apparent to me when I watched an TV program about an archaeological dig somewhere in North Carolina (?). Whilst looking for evidence of early settlements (ca 300 years old) they were searching the ground painstakingly by hand with magnifying glasses and teaspoons. The John Deere excavator was banned from coming anywhere near the site.
Meanwhile, over in Italy, anything that is just 300 years old gets described as a "new-build".
And that is why Italy tops the table in terms of World Heritage sites (54), followed by China (53).
After that come a clutch of other European nations, India, & Mexico,
The final insult is that the USA come in at 11th, just after Russia, and... wait for it... Iran.
For a nation that considers itself #1, boasts the Grand Canyon, Yellowstone, and the Everglades, these are hard facts to swallow.
However, as stated above, UNESCO is about many things, very few of which seem to favor a US agenda.
Nothing to see here; move along please.