Funny you guys say you would fight but only if America (govt) didn't deserve to be invaded or didn't mettle in another nation's business. Well, They wouldn't be invaded if they didn't deserve to be or didn't meddle (the other reason they may be invaded is if they were weak, and we all know THAT isn't a viable explanation for an invasion attempt on U.S. soil). They are in the business of meddling with other peoples business as history has shown. The isolationist stance has been long gone now, we are actively seeking to further our benefits from one end of the earth to the other, whether that means helping Israel, bombing Iraq, bombing Yugoslavia, not aiding the Chechens (because of U.S. oil interests), bombing the Chinese embassy (accident? the most advanced military in the world REALLY uses maps 3+ years old??), bombing (illegally) Sudan, and Afghanistan (suspiciously at the same time of Clinton's impeachment). This is clearly an example of new imperialism. I'm not saying don't fight for this country, all i'm saying is where will you draw the line on what "we" started and what we didn't. How many degrees back will you go?
I personally think it is a more interesting question to ask a second generation natural citizen of the U.S. if they would fight their parent's homeland or not in a war between that nation and the U.S. (for whatever the reason of the war is) I don't know if you'll get an honest anwser (or even an answer) to that though.