UNESCO runs the influential World Heritage Sites program. There are 26 UNESCO World Heritage sites in the United States

President Donald Trump pulled the United States out of the U.N. culture and education agency UNESCO on Tuesday, repeating a move he had already ordered during his first term, which had been reversed under Joe Biden.

During the Biden administration, the U.S. rejoined the agency in 2023. But now, just two years later, the current administration has announced its second exit from UNESCO, effective December 31, 2026.