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Athens used the power of its empire to intervene in the affairs of the southern Greek cities in the Peloponnesian Peninsula and their colonies. These incursions were principally in Corcyra and Potidaea and finally its trade rival Megara which Athens set out to bankrupt. The Peloponnesian League, led by Sparta, of which Megara was a member, demanded that Athens cease this; Athens refused and war broke out.

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8y ago

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