Donald Trump’s stunning electoral defeat of Hillary Clinton marks a watershed not just for American politics, but for the entire world order. We appear to be entering a new age of populist nationalism, in which the dominant liberal order that has been constructed since the 1950s has come under attack from angry and energised democratic majorities. The risk of sliding into a world of competitive and equally angry nationalisms is huge, and if this happens it would mark as momentous a juncture as the fall of the Berlin Wall in 1989.

The manner of Trump’s victory lays bare the social basis of the movement he has mobilised. A look at the voting map shows Clinton’s support concentrated geographically in cities along the coasts, with swaths of rural and small-town America voting solidly for Trump. The most surprising shifts were his flipping of Pennsylvania, Michigan and Wisconsin, three northern industrial states that were so solidly Democratic in recent elections that Clinton didn’t even bother to campaign in the latter one. He won by being able to win over unionised workers who had been hit by deindustrialisation, promising to “make America great again” by restoring their lost manufacturing jobs.

We have seen this story before. This is the story of Brexit, where the pro-Leave vote was similarly concentrated in rural areas and small towns and cities outside London. It is also true in France, where working-class voters whose parents and grandparents used to vote for the Communist or Socialist parties are voting for Marine Le Pen’s National Front.