History of Oceania

What was the main reason that Athens and Sparta fought Peloponnesian War?

The Peloponnesian War was triggered by conflicts regarding Megara's exclusion from the Delian League and Athenian influence in Peloponnese, leading to direct confrontations such as Potidaea's revolt against Athens. As hostilities grew, broader issues, including mutual fear and political rivalry fueled the prolonged warfare lasting over two decades