The United States of America, also known as the United States, the U.S., the U.S.A., the U.S. of A, the States, and America, is a country in North America. A federal republic, the United States shares land borders with Canada and Mexico, and extends from the Atlantic Ocean to the Pacific Ocean. Its capital is Washington, D.C.
The present-day continental United States has been inhabited for at least 15,000 years by Native Americans. After 16th-century European exploration and settlement, the English established new colonies, and gained control of others, in the eastern portion of the continent in the 17th and early 18th centuries. On 4 July 1776, at war with Britain over fair governance, thirteen of these colonies declared their independence; in 1783, the war ended in British acceptance of the new nation. Since then, the country has more than quadrupled in size: it now consists of 50 states, one federal district, and a number of overseas territories.
At over 3.7 million square miles (over 9.1 million km²), the U.S. is the third largest country by area. It is also the world's third most populous nation, with nearly 300 million people.
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Historical Documents :: United States

Center for American History - Collections at the University of Texas examining the historical development of the United States.
Meta Description: [ The Center for American History at the University of Texas at Austin is a special collections library, archive, and museum that facilitates research and sponsors programs on the historical development of the United States. The Center supports research and education by acquiring, preserving, and m... ]
Library of Congress American Memory - Hold primary source and archival materials relating to American culture and history.
National Archives - Holds the records of the United States Federal government. On-line access to art works, census data, U.S. legal manuscripts, the Federal Register and numerous additional materials.
Meta Description: [ Archives.gov Home Page ]
National Union Catalog of Manuscript Collections (NUCMC) - Cooperative cataloging program operated by the Library of Congress. Find information about the program, archives and manuscript repositories, and about topics of interest to archivists and their institutions' patrons.
Meta Description: [ National Union Catalog of Manuscript Collections ]
Office of Technology Assessment Archive - OTA was established by Congress in 1972 to provide congressional committees with analyses of emerging, difficult, and often highly technical issues.
Seattle Archdiocesan Archives - Collection examines the Catholic Church in the Pacific Northwest, including sacramental, academic and corporate records, as well as photographs and artifacts.
The National Security Archive - An independent non-governmental research institute and library located at The George Washington University. The Archive collects and publishes declassified documents acquired through the Freedom of Information Act.
USPTO Web Patent Databases - The US Patent and Trademark Office (PTO) now offers World-Wide Web (Web) access to bibliographic and full-text patent databases.
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