It would be “liberation day” in the US, the White House announced. Well, we shall see. Yet even if one puts the noise and nastiness that accompany a Donald Trump announcement to one side – in this case tonight’s pronouncement that there will be an executive order announcing “reciprocal tariffs on countries throughout the world”, a 10% tariff on the UK and 20% on the EU – the significance of the theatre is hard to miss. Whether they presage the US’s liberation, or instead the disintegration of the global trading order, Trump’s tariffs add up to an attempt to transform