Well, there's no possible way that circumcision could be relevant to feelings of patriotism. If the question is about nationalism (as Robert suggests), then I'd guess not; the people who indulge in nationalism are more likely to see it as Jewish or Muslim. Of course, that's just a guess at this point; I'm still absorbing the idea that it's still so common.This discussion has happened here before. Echoing roughly what I said then: It happens in the US because it's the norm. Norm being synonymous with tradition.
I'm wondering what are the psychological effects of this operation are...
Do you strongly associate it with being an American male?
If so, then might it subconsciously strengthen your national identity?. ie, it helps you to feel American?
If so, might it strengthen feelings of patriotism?
I do admit, though, that I wish I had an American flag made out of my foreskin.