At the same time, China and Russia have gone on massive military spending sprees that are entirely aimed at global war.
World peace relies on a single point of failure: the US nuclear forces, which rely primarily on obsolete ICBMs. Failing that, Russia and China could easily take over the world using conventional forces and their own nuclear power.
The US nuclear triad is highly vulnerable, relying on 3 incredibly obsolete and vulnerable delivery mechanisms.
1. US ICBMs were supposed to be replaced and were not due to government bureaucratic bungling. The contracts to replace it are being awarded in 2017. There are 400 ancient ICBMs, in fixed silos, that can't be called back after launch and so may not be launched in time.
2. The 18 Ohio SLBM subs are old and easily found by major enemy navies, and are just one nuclear torpedo each away from being gone. Some may survive but not enough. They should've been replaced long ago.
3. The few dozen ancient B-52s have to fly for many hours to be able to launch their cruise missiles, which means they'll be shot down. Their their run ways may get destroyed before most even take off.