We used to have long debates about American exceptionalism, about whether this country was an outlier among nations, and I always thought the bulk of the evidence suggested that it was. But these days our political attitudes are pretty ordinary. America, far from standing out as the champion of democracy, as a nation that welcomes immigrants, as a perpetually youthful nation energised by its faith in the American dream, is now caught in the same sour, populist mood as pretty much everywhere else.

Earlier this year, for example, the Ipsos research firm issued a report based on interviews with 20,630 adults in 28 countries, including South Africa, Indonesia, Brazil and Germany, last November and December. On question after question the American responses were, well, average.