United Nations — The United Nations' education, science and culture agency, UNESCO, is best known around the world for the formal identification of World Heritage Sites — places such as Yellowstone National Park and international landmarks like Egypt's pyramids and India's Taj Mahal. But the U.N. agency has long been a point of political contention in Washington, and U.S. membership has been on-again-off-again for decades as various administrations grapple with allegations of bias. On Monday, UNESCO's Executive Director announced that the U.S. intended to re-join the agency. "This is a strong act of confidence, in UNESCO and in multilateralism," Audrey...