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- the persian empire had become the most powerful empire in the world and the greek city-states needed to team up to protect themselves from being conquered- the battle of marathon: king darius underestimated the greek city-states and they defeated the persian army (pheidippides was told to run back to athens to tell them they had won: marathons)- the greeks later win again at the battle of platea and they prove their might so the persians back away- athens forms the delian league and it becomes so powerful that athens becomes an empire - ^^^ the golden age of athens begins: pericles led this empire and money from the delian league is used to rebuild athens and advance in arts and science

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