Websites

Government
Official U.S. government Web portal
[Gateway to governmental sites]
http://www.usa.gov
White House
[Official site of the President of the United
States]
http://whitehouse.gov
U.S. Senate
http://www.senate.gov
U.S. House of Representatives
http://www.house.gov
U.S. Supreme Court
http://www.supremecourtus.gov
Library of Congress
http://www.loc.gov
U.S. Bureau of the Census
http://www.census.gov/
Statistical Abstract of the United States
http://www.census.gov/compendia/statab/
U.S. Central Intelligence Agency
CIA World Factbook
http://www.cia.gov/library/publications/
the-world-factbook/index.html
U.S. Department of State
http://www.state.gov

Celebrations
Holidays on the Net
http://www.holidays.net

History
Historical Documents
National Archives and Records Administration
http://www.NARA.gov
Historicalstatistics.org - Links to historical
statistics of USA
http://www.historicalstatistics.org/index2.html

Immigration
U.S. Citizenship and Immigration Services
USCIS.gov.
http://www.uscis.gov/graphics/index.htm

Maps
National Atlas of the United States
http://nationalatlas.gov