When Donald Trump stood before union auto workers in the Rose Garden he declared “Liberation Day”, promising to stand up for Main Street. Whether that pledge will be fulfilled is moot. He will declare victory either way. What the US president offered was not just an economic programme, but an imperial one.

Mr Trump’s logic, if it exists, lies in the 397-page report on “foreign trade barriers” he brandished on Wednesday. Its message is brutally simple: you may sell your goods to Walmart shoppers, but only if you let US cloud services hoover up your data, US media flood your screens and US tech monopolies operate on their terms – not yours. TikTok is the test........

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