What were similarities and difference between Athens and Sparta?

Sparta and Athens had many differences and similarities in their government. Only a few Greek city-states had kings. Sparta had two kings, usually cousins or brothers. One would stay home and the other would go off to fight wars. Athens created the first democratic system and many other city-states copied them. Athenian democracy did not give power to everyone. Most of the people in Athens couldn't vote, including women, slaves, foreigners, and children.