“The Eisenhower interstate system requires that one mile in every five must be straight. These straight sections are usable as airstrips in times of war or other emergencies.”

More united states facts

In 1978, only eight percent of U.S. households had microwave ovens. As of 2006 over 80 percent have them.

The size of a typical American home has increased from 1100 to 1800 square feet over the past ten years.

Ninety-nine percent of the natural gas used in the United States comes from North America.