As Samurott said, whether you are a US citizen or not, choose whichever one suits you best.

And don't worry, you won't get told off at all. In fact, you don't even have to include any nationality.

I didn't notice an "immigration debate", but that could be mildly amusing.

Barring immigration debates....

Usually people on this site choose the country that they feel they are from, not that they necessarily are citizens of. Most of the time, that goes hand-in-hand, but sometimes people are citizens of one country but have been living in another for so long they feel they belong to THAT one instead.

So in your case, I'd say go ahead with whichever one you feel you belong to most.

Not entirely true, Celtic Kate. It is more complex than that. There are not only laws regarding naturalization (overseen by the Fourteenth Amendment to the U.S. Constitution), but an application process and, at least in terms of "naturalization", a question of birth to at least one standing U.S. citizen.

http://www.american-citizenship.org/