I think America is a greater threat than ANY other country in the World by far. Its foreign policy is an absolute disaster and in very large part, responsible for the terrorism we see today. The US seeks to control, marginalise, isolate and separate any thinking that is different to America's as wrong.
In doing so it brings down a torrent of anti- American sentiment, mistrust and even hatred on itself. The only people that can't seem to see this are the Americans themselves. Shoot it, lock it up, execute it, invade it or sanction it; that's the American way.
What makes America more dangerous above anything else is the fact she thinks she's right and that, coupled with that peculiarly American brand of right wing zealotry, is very dangerous indeed!
America would do well to join the rest of the World instead of rampaging around trying to run it or fix it. A 250 year old country could learn much from one that is 10000years old. Be a good World citizen, try cooperation and involvement instead of competition and confrontation.
These values would serve America well. Lets face it, her present methods don't seem to be doing her any favours, do they? It is doing harm to the rest of us too.