Military Power

Sieges were most common in the Middle Ages. According to hyw.com, sieges were conducted by a larger army cornering a smaller one, for long periods of time. This involved starving them of supplies, weapons, etc. The most recent siege, which a lot are familiar with was the Siege of Gaza. But, in today's modern war-fare, how easy would it be for a smaller nation or group of nations to cut off supplies to the U.S.? The United States is so addicted to imports and other foreign products that if it were ever to undergo a siege, would it survive? Of course, the U.S. Navy would be there to try and remove the blockade, but how long would that take if a group of nations ever wanted to try and starve out the entire country? The only real natural resources the U.S. can produce without buying from another country are timber, ores and coal. If countries were to put the U.S. under siege, it would be starved of crude oil which would plunge the the country into the stone-age instantly. I guess what I'm trying to say is, what do you think about the whole idea? Is it possible for this scenerio to happen to the United States or any other country with bodies of water on either side of it?

Even if there werent any organizations like NATO or the UN and it were "every superpower for itself", the US would be hard to overcome through strength of arms. If it were besieged, the armed forces should be able to break through, being the strongest army in the world (when I last checked).

If the besieging power is so strong as to be able to hold the army, it would have no problem actually crushing the US army itself. The weakness of this nation is the energy and resources supplying. If oil stops flowing in, the US, with their oil-dependent economy, are down.