** [http://www.house.gov House] - Official site of the United States House of Representatives
** [http://www.supremecourtus.gov Supreme Court] - Official site of the Supreme Court of the United States
** [http://www.census.gov/hhes/www/ U.S. Census Housing and Economic Statistics] Updated regularly by U.S.
** [http://usinfo.state.gov/usa/infousa/facts/factover/homepage.htm Portrait of the United States] - Published by the United States Information Agency, September 1997.
** [https://www.cia.gov/library/publications/the-world-factbook/geos/us.html CIA World Factbook Entry for United States]
** [http://www.ers.usda.gov/statefacts/ Population, employment, income, and farm characteristics by State]
** [http://www.travour.com/tours-to-usa/index.html Tours to USA]
** [http://www.nationalcenter.org/HistoricalDocuments.html Historical Documents]
** [http://www.religioustolerance.org/nat_mott.htm National Motto: History and Constitutionality]
** [http://www.historicalstatistics.org/index2.html Historicalstatistics.org] - Links to historical statistics of USA
** [http://www.wikimapia.org/#y=41771312&x=-99492187&z=4&l=0&m=a WikiSatellite view of United States] at [[WikiMapia]]
** [http://nationalatlas.gov/ The National Atlas of the United States.]
** [http://www.united-states-map.org United States map]
** [http://www.uscis.gov/graphics/index.htm U.S. Citizenship and Immigration Services] USCIS.gov.
** [http://www.immihelp.com/citizenship/us-citizenship-sample-civics-questions.html U.S. citizenship sample civics questions for naturalization interview] Immihelp.com - from an immigrant to future immigrants.
** [http://www.iandoli.com/documents/Sample_Civics_Questions.html Civic Orientation - Sample Questions for Naturalization]
** [http://www.idea.int/countryprofile.cfm?CountryCode=US Voter turnout, Gender quotas, Electoral system design and Political party financing in United States]