Explorer Matching Game

http://www.quia.com/mc/66029.html

U.S. History - Colonial Challenge

http://www.quia.com/rr/4049.html

State and Capital Games

http://www.gcisd.net/techlessons/5thGrade/socialstudies/states

 3 Branches of Government Game

 http://www.usmint.gov/kids/games/branchesOfPower

 Lewis and Clark Adventure Game

 http://www.usmint.gov/kids/games/LewisClarkAdventure

 Benjamin Franklin Fly a Kite Game

http://www.usmint.gov/kids/games/franklinsTry%2Dn%2Dfly

Inventors Challenge 

http://www.usmint.gov/kids/games/inventorsChallenge

 History Puzzles

http://www.usmint.gov/kids/games/puzzleMint