Additional helpful sites:

 www.eduplace.com

World Book Online https://www.worldbookonline.com. 

Username:  gnrstu

Password: ewrsd09

https://statesymbolsusa.org/

https://kids.kiddle.co/

http://www.50states.com/

http://awesomeamerica.com/

http://mrnussbaum.com/united-states/united_states/

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

http://www.ducksters.com/geography/usgeography.php