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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Athens imposed crippling trade restictions on Megara, a Peloponnesian League city. Sparta, leader of the League, demanded withdrawal of the penalties, Athens refused and war ensued.
Athens and Sparta fought in the Peloponnesian War.
We call it today the Peloponnesian War. It was a 27-year war between the Athenian Empire and the Peloponnesian League led by Sparta.
The Peloponnesian War lasted 27 years (431-404 BC).
There was one Peloponnesian War, won by the Peloponnesian League over the athenian empire.
The two city-states that fought in the Peloponnesian war were Athens and Sparta.