Originally Posted by CyberSEO

The real power of the USA is not in its overpriced and completely useless army, not in its people and not in its industry. The real power of the USA is in almighty dollar. If dollar will be replaced by other currencies/gold/whatever, the USA will turn into a regular 3rd world country - you just won't be able to spend 10x times more than you produce, like you are used to. That's why it's extremely important to keep it as a would-wide currency.

[Edit] I've just read other replies to your post in this tread. Seems the guys have already explained it very well here.