King Charles’s speech to the US Congress – only the second such address by a British monarch – demonstrates how much both the US and the UK have changed in the last three decades. The first speech was in May 1991 during his mother, Queen Elizabeth II’s, third state visit to the US. The underlying purpose of both speeches was the same: to stress the enduring links between Britain and the US. But the circumstances in which they were delivered were very different.The late queen’s speech came in the wake of joint action by US and British forces, along with other allies, to eject Saddam Hussein’s Iraqi troops from Kuwait. She referenced this in her speech as a concrete example of the strength of the Anglo-American alliance. In 2026, the UK has pointedly refused to join the US-Israeli attack on Iran, angering President Donald Trump. Charles’s speech adroitly inverted the moral of this apparent diplomatic rift, suggesting that tensions in the past had always been overcome. Referring to the revolution of 1776 he noted: “Ours is a partnership born out of dispute, but no less strong for it”, because ultimately “our nations are in fact instinctively like-minded”.A speech like this, voiced by the monarch, can serve at least two useful purposes. The first is to portray things that are, at heart, profoundly political, as being somehow above politics. The second is to place the transitory difficulties of day-to-day diplomacy within the much longer-term perspective of a dynasty that traces its lineage back to the Norman Conquest. These two elements featured in how both Elizabeth II and Charles’s speeches depicted the Anglo-American alliance. The latter was the basis of a joke by the king, who referred to the actions of the Founding Fathers “250 years ago, or, as we say in the United Kingdom, just the other day”.Charles’s speech was beautifully crafted and delivered with a degree of warmth and conviction that was always beyond the range of his mother’s public oratory. That, in itself, was almost an implicit reproach to the president’s own rambling, undisciplined public pronouncements. And in more than one way the address was pitched over the head of Trump. The lack of any immediate pushback from the president suggests that the subtlety of some of the messaging eluded him. But in a more significant sense, it was an appeal to causes that still resonate with much of the American political class if not with the Trump administration itself. Charles stressed the value of Nato and the importance of “the defence of Ukraine and her most courageous people”. He made a sly reference to his proud association with the Royal Navy – an institution that has been the subject of some disparagement by Trump in recent weeks. He emphasised the importance of protecting the environment, although couched in a Trumpian language of profit and loss: “We ignore at our peril the fact that these natural systems – in other words, Nature’s own economy – provide the foundation for our prosperity and our national security.”Perhaps his most pointed remarks – and those that generated the loudest applause from some (although not all) in the hall – were directed at the US itself. He described Congress as “this citadel of democracy created to represent the voice of all American people”. He mentioned the role of Magna Carta in laying the foundation for the constitutional principle that “executive power is subject to checks and balances”. Trump’s opponents clearly enjoyed that.Saving the special relationshipState visits by British monarchs to the US have been relatively rare, and state visits to London by US presidents are even rarer. Trump is unique in having made two. This in itself is a mark of the desperate attempts by British governments, both Tory and Labour, to find ways of managing relations with his administration. This desperation was also apparent in Keir Starmer’s reckless decision to appoint Peter Mandelson as British ambassador to Washington. The king’s speech pushed in interesting ways at the boundaries of what a British monarch might be expected to have said in Trump’s America. Yet some of the sentiments in his mother’s 1991 address to Congress – considered uncontroversial at the time – could no longer be expressed without the risk of offending the current administration. Queen Elizabeth noted: “Some people believe that power grows from the barrel of a gun. So it can, but history shows us that it never grows well nor for very long. Force, in the end, is sterile.” That may be a lesson Trump will have to learn the hard way. But for the moment, he and his immediate circle seem to have an unwavering belief in the primacy of kinetic force, and have little interest in the objective Charles described of stemming “the beating of ploughshares into swords”.The queen also commended “the rich ethnic diversity of both our societies”. Charles spoke instead about interfaith understanding. This is not quite the same thing – but is certainly more compatible with the Trump administration’s disturbingly relaxed approach to the rise of white-supremacist politics.Perhaps the saddest feature of a comparison of the two speeches is the queen’s proud boast in 1991 that “Britain is at the heart of a growing movement towards greater cohesion within Europe, and within the European Community in particular”. If the US has changed since 1991, so has Britain. It would be nice to think that one day the monarch might give an equally generous speech about shared history and values in front of the UK’s European neighbours.Philip Murphy has received funding from the AHRC. He is a member of the European Movement UK.