King Charles III prepares for four-day U.S. state visit amid UK-US diplomatic tensions over Iran

King Charles III's upcoming state visit to the United States is being shaped at the request of the British government, and is designed to reinforce the long-standing bonds between the two nations at a moment of diplomatic friction. The trip includes a commemoration of the September 11, 2001, attacks, a ceremony honoring fallen service members, and an event marking the 100th anniversary of A.A. Milne's Winnie the Pooh stories, according to the Associated Press.

The visit follows a pattern stretching back to 1939, when King George VI became the first British monarch to visit the United States. Presidential historian Douglas Brinkley of Rice University told the AP that the monarchy has historically served as a stabilizing force distinct from government politics: "Politics come and go, prime ministers, presidents, come and go, but there's something deeper about the special relationship between the United States and the U.K."

A central moment of the trip will be Charles's address to a joint session of Congress, where he is expected to draw on themes of American exceptionalism, the history of the US-UK alliance, and shared democratic values, Brinkley told the AP. His late mother, Queen Elizabeth II, set a high benchmark with her 1991 address to Congress, in which she quoted Abraham Lincoln, Franklin D. Roosevelt, and Ralph Waldo Emerson, and drew a standing ovation. Royal biographer Robert Hardman described the purpose of Charles's visit plainly: "He's going because 250 years ago the Founding Fathers of the USA kicked out his great-times-five grandfather, and he's going to say, 'No hard feelings.'"