https://usahello.org/ information center for life in the USA; education, work, health, citizenship, immigration.

https://www.uscis.gov/citizenship-resource-center/ everything you need to know to live and work in the USA.

https://www.visittheusa.com/ official travel site of the USA.

https://www.usa.gov/ facts about the USA: History, Presidents, laws, statistics and much more.

https://whc.unesco.org/ UNESCO World heritage sites in the USA.

https://www.arcgis.com/ explores the diversity of American food culture.

https://www.bea.gov/ Bureau of Economic Analysis produces economic accounts statistics to help measure and understand the nation’s economic performance.

https://www.bls.gov/home.htm labor statistics

https://www.census.gov/ QuickFacts provides easy access to broad data about people, business, and geography.

https://www.selectusa.gov/welcome 

http://legacy.trade.gov/index.asp International trade administration