While we probably have superior technology, we have to realize their numbers would overpower us. They have resources, and almost all of are stuff is made there. in case you havent noticed, our superior tech allows us to kill from a distance and at night, which is why we kicked the shit out of Iraq in BOTH wars, and incase you havent noticed, thier economy is already gonna go to shit in a couple years, somthing major like a war would bankrupt thier ENTIRE government. As to your qutoe about neuculear war- If it did come to nuclear warfare, while i'm sure the our nuclear weapons are better, it doesn't change the fact a old nuclear warhead would still take out a lot of land. China could overwhelm us. Are only chance would be if Russia helped us. For those who beleive our own propaganda that we have the strongest army we have things called PATRIOT ANTI-MISSILE DEFENSE SYSTEMS. they can take older neuclear warheads down easy, not even counting the craploads of incredibly advanced technology that the government keeps from us. dont delude yourself, the F-117, seen by us as an incredibly advanced stealth fighter-bomber, was revealed 10 YEARS after it was created and in use. also- RUSSIA IS CRAP(no offense to you russians out there) their country is still recovering from the breakdown of the communist government in the 80s, they couldent field a large enough army to do anything to china at the moment.
Really, try to think of money when you determine political situations, its what makes the world go 'round.