You're right. And our descendants will refer to this as the oil age. Petroleum is our only god.

Saudi proverb. "My father rode a camel. I drive a car. My son flies a jet airplane. His son will ride a camel."

http://en.wikipedia.org/wiki/Peak_Oil

The US consumes 20.73 million oil bbl/day, of which 13.15 million are imported. Global consumption of oil is 82.59 million bbl/day. After a quick calculation you will see that the US consumes almost 25%, while it represents 6% of world's land surface area.