These are the questions you will need to be able to answer. The Persian Wars left Athens as the predominant power in Greece. Athen's arrogance and aggressiveness would lead to the Peloponnesian wars which would result in a temporary Spartan victory, the collapse of Athen's democracy, the eventually downfall of Sparta at the hands of Thebes, and the conquest of all Greece by the Macedonians. These are only a few of the consequences of this war. There was a tremendous loss of life and trade which greatly weakened Greece.
It was the leadership of Alexander the Great that would unite Greece and spread the Greek culture around the known world.