The first known inhabitants of modern-day United States territory are believed to have arrived over a period of several thousand years beginning sometime prior to 15,000 - 50,000 years ago by crossing

Pre-Columbian period Main article: Pre-Columbian The earliest known inhabitants of what is now the United States are thought to have arrived in Alaska by crossing the Bering land bridge, at least 14

The United States is a country in the Western Hemisphere. It consists of forty-eight contiguous states on the North American continent; Alaska, an enormous peninsula which forms the northwestern most

The government of the United States is based on a written constitution, the shortest in the world in fact. This constitution consists of a Preamble, seven Articles, and 27 Amendments. From this docume