Complacency will be your biggest enemy. Why arent the Romans, the Mongols, The Spanish, the Dutch, Napolean and the Brits still ruling the world?
All of them were Super Powers once. Many ruling more of the world than the US has control or allegiances with now. At this time in our history, the US is the greatest Military Power on earth but what would it take to bring them down?
Bad Foriegn Policy or a recession perhaps. Internal strife? History tells us that Super Powers have a limited lifespan with War or other means deciding on new World Leaders. Are you that complacent that you would ask for War against a Country the size of China and risk the Arabic Countries who in my opinion cannot be trusted anyway, changing allegiances for religious or cultural reasons?
The US is powerful but only as powerful as its alliances. It will give someone a huge kick in the prettythang and a bloody nose but short of including itself in self annhilation, it cant take on the world by itself. Remember Vietnam? Many reasons, most of which cannot be anticipated in the hectic whirlpool of War could change the tide of victory. Germany gave it a shot and lost.
Your patriotism is to be admired but dont lace it with complacent stupitidy or it may well be your downfall. At somepoint in the future, however far ahead, there is going to be another all powerful entity on this planet. 10 years, 100 or 1000, it will come.
Perhaps next it will be Chinas turn.