States are part of countries, and countries may be grouped by other areas, like continents, hemispheres, or a political or economic body. The US is also commonly referred to in three distinct ways: as ...

Scientists discover massive deposits of this valuable resource sitting beneath the feet of millions of Americans.

The first map of the United States drawn and printed in America by an American was, until a few years ago, hardly known at all. Only seven original copies exist, and the best preserved is now on ...