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Each city-state, or polis, had its own government. Some city states were monarchies ruled by kings or tyrants. Others were oligarchies ruled by a few powerful men on councils. The city of Athens invented the government of democracy and was ruled by the people for many years.
Each city-state ruled itself. They differed greatly from the each other in governing philosophies and interests. ... Another reason city-states formed, rather than a central, all-encompassing monarchy, was that the Greek aristocracy strove to maintain their city-states' independence and to unseat any potential tyrants.
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