The biggest shift in American politics has nothing to do with Stormy Daniels or Michael Cohen, Fox News or golf courses. Indeed, its author is not Donald J Trump. Yet the implications stretch far beyond this year’s presidential elections, and affect countries across the world. The era of free trade is dying, and the man bringing down the guillotine represents the party that in the past three decades has been evangelically pro-globalisation: the Democrats.

Last week, Joe Biden imposed tariffs on a range of Chinese-made goods. Electric cars produced in China will now be hit with import tax of 100%, chips and solar cells 50% and lithium-ion batteries 25%. These and other tariffs on goods worth an estimated $18bn a year amount to a rounding error in the giant US economy. And in an election year, Mr Biden, who hails from Scranton, Pennsylvania, is fretting........

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