The film doesn't give us his back story, it may be that he was born in the US or moved there at a young age.
But there's nothing unrealistic about the idea of someone following a sports team from a different country.
I am an English football fan. I know plenty of non-English fans of my club, some of whom have never been to England but know more about the history of the club than plenty of English fans who go to the games. I get the feeling that when you're following a club from a distance like that, there's a tendency to read up on it, to get to know the history, in a sense as a way of proving your worth as a fan.
I also know plenty of English people over here who are fans of american sports teams in the US. This way round, it's even more common, because US sports don't travel so well. By which I mean, if you're a European who's into American football or baseball, then you will tend to follow an American gridiron or baseball team, simply because we don't have such teams over here.
So, I find transatlantic following of a sports team extremely easy to believe.
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