State Symbols:

http://www.statesymbolsusa.org/index.html

 

50 States.com

http://www.50states.com

 

Enchanted Learning

http://www.enchantedlearning.com/usa/states

 

Information Please

http://www.infoplease.com/states.html

 

World Health Organization

http://www.who.int/countries/usa/en

 

CIA Manual

https://www.cia.gov/library/publications/the-world-factbook/index.html