Britain’s King Charles and ⁠Queen Camilla arrived in the United States on Monday afternoon for a four-day trip, a tour which has taken on even greater prominence after the White House Correspondents’ dinner shooting and amid acrimony between the close allies.

The state visit, by far the most high-profile and consequential of Charles’ reign, marks the 250th anniversary of the US declaration of independence from British rule, and is the first to the country by a British ‌monarch for two...