The first thing I ever heard about Americans was that they all carried guns. Then, when I came across people who’d had direct contact with this ferocious-sounding tribe, I learned that they were actually rather friendly. At university, friends who had traveled in the United States came back with more detailed stories, not just of the friendliness of Americans but also of their hospitality (which, in our quaint English way, was translated into something close to gullibility). When I finally got to America myself, I found that not only were the natives friendly and hospitable, they were also incredibly polite. No one tells you this about Americans, but once you notice it, it becomes one of their defining characteristics, especially when they’re abroad.

This is very strange, or at least it says something strange about the way that perception routinely conforms to the preconceptions it would appear to contradict. The archetypal American abroad is perceived as loud and crass even though actually existing American tourists are distinguished by the way they address bus drivers and bartenders as “sir” and are effusive in their thanks when any small service is rendered. We look on with some confusion at these encounters because, on the one hand, the Americans seem a bit country-bumpkinish, and, on the other, good manners are a form of sophistication.

Granted, these visiting Americans often seem to have loud voices, but on closer examination, it’s a little subtler than that. Americans have no fear of being overheard. Civic life in Britain is predicated on the idea that everyone just about conceals his loathing of everyone else. To open your mouth is to risk offending someone. So we mutter and mumble as if surrounded by informers or, more exactly, as if they are living in our heads. In America the right to free speech is exercised freely and cordially. The basic assumption is that nothing you say will offend anyone else because, deep down, everyone is agreed on the premise that America is better than anyplace else. No such belief animates British life. On the contrary. A couple of years ago a survey indicated that British Muslims were the most fed-up of any in Europe: a sign, paradoxically, of profound assimilation.

If the typical American interaction involves an ostensibly contradictory mixture of the formal (politeness), the casual and the cordial, what happens when one moves beyond the transactional? Like many Europeans, I always feel good about myself in America; I feel appreciated, liked. It took a while to realize that this had nothing to do with me. It was about the people who made me feel this way: it was about charm. Yes, this is the bright secret of life in the United States: Americans are not just friendly and polite — they are also charming. And the most charming thing of all is that it rarely looks like charm. The French put a rather charmless emphasis on charm, are consciously or unconsciously persuaded that it is either part of a display of sophistication or — and it may amount to the same thing — a tool in the service of seduction.