Of the many jokes cracked by King Charles during his visit to Washington, the one recalling the definitive 18th-century Anglo-French contest for dominion over the New World was the most pointed. Speaking at a state banquet in the White House, Charles turned to Donald Trump and said: “You recently commented, Mr President, that if it were not for the United States, European countries would be speaking German. Dare I say that, if it wasn’t for us, you’d be speaking French!”

Did Trump get it? Who knows? Broadly speaking, history, even their own, is not most Americans’ favourite subject. A forward-looking people, they do not dwell on the past, nor hanker after the illusory felicities of former glories. While generations of Britons still wallow in nostalgia for Spitfires, Churchill and Vera Lynn (and beating the French), Americans typically seek new metaphorical mountains to climb. Theirs is a positive outlook, on the whole. Except, under Trump, it has twisted into a revived, ugly version of US “manifest destiny” imperialism.

In his quiet, understated way, Charles had a lot to say about all that. Addressing Congress, he did not give Trump the serious tongue-lashing many in Britain (myself included) had been hoping for. Given the constitutional and political constraints, it was a ballsy performance nonetheless. Charles may have succeeded in temporarily easing US-UK frictions. But his bigger achievement was to remind Americans, ever so gently, of who they are, where they come from, and how very much better they could and should be doing.

To put it mildly, the US, led by its manic president and the Republican party, has been acting out of character for a while now. Charles’s proffered antidote was calm, balm – and perspective. He supplied a mature, knowing lens........

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