Okay, Wraithy, but it's hardly as clear as that. Let us imagine that the country I'm interested in moving to, while a close ally of the US, is hardly in total agreement on all issues. In fact, they have a number of diplomatic disputes (hell, the US has diplomatic disputes with Canada, and they're practically our attic). I find it quite likely that I would be more likely to weight such disputes (and the satisfactory resolution thereof) more heavily if I were living in said country than if I was in the US. What do I care (other than intellectually) about some domestic spending proposal when I'm not living there?

Isn't there some minimum level of commitment needed to call yourself a citizen?