King George VI was the first British monarch to visit the United States
June 7th, 1939 - first visit to the US
King George VI becomes the first British monarch to visit the United States when he and his wife, Elizabeth, cross the Canadian-U.S. border to Niagara Falls, New York. The royal couple subsequently visited New York City and Washington, D.C., where they called for a greater U.S. role in resolving the crisis in Europe. On June 12, they returned to Canada, where they embarked on their voyage home.
George, who studied at Dartmouth Naval College and served in World War I, ascended to the throne after his elder brother, King Edward VIII, abdicated on December 11, 1936. Edward, who was the first English monarch to voluntarily relinquish the English throne, agreed to give up his title in the face of widespread criticism of his desire to marry Wallis Warfield Simpson, an American divorcee.
During World War II, King George worked to keep up British morale by visiting bombed areas and touring war zones. George and Elizabeth also remained in bomb-damaged Buckingham Palace during the war, shunning the relative safety of the countryside, and George made a series of important morale-boosting radio broadcasts, for which he overcame a speech impediment.
After the war, the royal family visited South Africa, but a planned tour of Australia and New Zealand had to be postponed indefinitely when the king fell ill in 1949. Despite his illness, he continued to perform state duties until his death in 1952. He was succeeded by his first-born daughter, who was crowned Queen Elizabeth II in June 1953.