Which superpower is going to nuke us?

Nuke four or five countries and you've got the rest of the world against you.

There are already places like N. Korea, China, Iran that are supposedly developing their own nuclear weapons. Then you've got the terrorists who'd be able to either acquire their own nuclear weapon, or do something with the nuclear plants/nuclear waste around the world. Either they bomb the nuclear plants and cause untold choas, or they acquire some of the nuclear waste and make a dirty bomb with it - set off a sizeable dirty bomb in the middle of an American city (or anyone allied with America) and you've not only killed however many hundreds of people with the initial blast, but there's also the fact that the blast will have acted like a giant sneeze and sent out a giant wave of radioactive material for quite a distance, effectively harming the majority of people within the blast radius, a bit further out, too, and shutting down an American city. Imagine if they did it in New York. The damage would be catastrophical!

As for other countries who might be clever enough to not use nukes - France, Germany, Italy, Russia, other European countries. Between them they can effectively control the UN. Look at what happened years ago when Bush decided to go to war in Iraq. The support for America was almost non-existent.

Add to the fact that there's a second Cold War quietly brewing (Russia planted a flag on the oil-rich sea-bed under the North Pole a few days ago, and are now claiming the territory as their own)... well, America has got to tread very carefully. Nukes would not only make the terrorists fight fire with fire, but the rest of the world would not exactly attack America, but they can cut you off.

Nukes, then, are out of the question, I think.