The State Department has published a brief statement titled "U.S. Multilateral Engagement: Benefits to American Citizens". I quote the section relating to UNESCO:
The UN Educational, Scientific, and Cultural Organization (UNESCO) helps to protect our cultural and natural property and landmarks, strives to keep sports doping-free, and promotes educational exchanges around the world. UNESCO’s World Heritage Convention attracts international visitors to our national parks and monuments, and helps ensure that those sites are protected for future generations. The International Convention Against Doping in Sport helps keep performance enhancing drugs out of sports, and ensure that only participants can bid to host the Olympic Games. The UNESCO Associated Schools Project Network, which includes more than 8,500 educational institutions in 180 countries, provides U.S. schools with opportunities to engage with their peers all over the world, including through programs on international understanding, intercultural dialogue, human rights education, and sustainable development.The State Department limited its statement to four pages, and thus its discussion of UNESCO to one paragraph. Let me add a second paragraph to that statement.
UNESCO seeks to promote peace by building the defenses of peace in the minds of men and thus protects American security, it does this through its worldwide education programs and by its support for a culture of peace. It plays a key role in improving education worldwide, providing American firms with educated foreign consumers and all our citizens with educated foreign partners in solving a host of global problems. UNESCO helps Americans to express their generosity helping the poorest people and the poorest nations in the world. It helps Americans promote democracy abroad by standing as a firm defender of freedom of the press. Not only does UNESCO help "to protect our cultural and natural property and landmarks," it helps to assure that those things are protected everywhere so that we Americans can see them when we travel and so that we can rest assured that those foreign sites will be there for our children and their children to know and enjoy. UNESCO has certified a global system of university chairs and networks which helps to enrich higher education worldwide, linking American universities with those in other continents. UNESCO helps American scientists to network with their colleagues worldwide, providing benefits from better prediction of tsunamis and earthquakes that might endanger our citizens, to developing a global network of bioreserves to help understand how to protect against environmental threats.