King Charles III extended his "warmest congratulations" to President Donald Trump and the American people on Saturday as the United States marked the 250th anniversary of its independence, a milestone he described as a moment of "great celebration for Americans everywhere" .

In a message shared on the Fourth of July, the British monarch reflected on the "extraordinary evolution" of the U.S.-UK relationship, noting that the two nations had overcome conflict to forge what he called one of the closest and most productive alliances in history . "Through centuries of shared challenge and achievement, our nations have built a relationship founded on friendship, trust and a belief in liberty," the King wrote .

The message also referenced the King and Queen Camilla's state visit to the United States in April. During that trip, Charles addressed a joint meeting of Congress and attended a state banquet at the White House, where he praised the deep ties uniting the two countries across defense, trade, science, and culture . "We were proud, and honoured, to be able to celebrate this special anniversary during our visit," the message said .

The April visit, which followed President Trump's second state visit to the UK in September 2025, was seen as a significant effort to reaffirm transatlantic ties amid political differences . The King highlighted the importance of democratic institutions and shared values, adding, "As we look ahead to the next 250 years, I have no doubt we will continue to defend our shared values" .

"The connection between our peoples is one that I trust will only grow stronger with time," Charles concluded, signing the letter simply, "Charles R." . The message was released shortly after the conclusion of Royal Week, also known as Holyrood Week, in Scotland.