How was Greek society organized politically? What were the most important city-states?

Greece is a parliamentary representative democratic republic, where the President of Greece is the head of state and the Prime Minister of Greece is the head of government within a multi-party system. Legislative power is vested in both the government and the Hellenic Parliament.Some of the most important city-states were Athens, Sparta, Thebes, Corinth, and Delphi. Of these, Athens and Sparta were the two most powerful city-states.

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