Here is an interesting question, what if America was invaded by land, by another huge army. What I am saying is if both the east and west coast were invaded by millions of foot soldiers that would move across the entire country. Think of this if like a D-Day happened in America. So where would you go? What would you do? Would you fight or hide? Hey you never know if this could happen but America would probably have a nuke war before this happens.
The truth is the UN cant do anything without 5 countries involved. (yes it pisses me off that Canada isn't one of them) I believe they are America, China, France, England.....and......****! drawing a blank =P