NHD: Checks and balances

http://www.congressforkids.net/Constitution_checksandbalances.htm(hosting site: http://www.dirksencenter.org/); Checks and Balances, PBS 2008.

This site tells how with the government split into 3 branches they built the check and balances system.  It makes sure that not one branch has more power than another.  It tells us how the president can veto, but be overrode by at least 2/3 votes of both houses.  

This would be a secondary source because it was written after the constitution was built and adopted by the U.S.  The sites audience was mean for kids, if i read this just how it is, would use terms and things i don't understand.