what are city states?
http://www.historyforkids.org/learn/government/polis.htm
http://en.wikipedia.org/wiki/City-state
http://www.bing.com/search?q=City+States+in+Mesopotamia&FORM=R5FD
http://en.wikipedia.org/wiki/City-state
http://www.bing.com/search?q=City+States+in+Mesopotamia&FORM=R5FD