How does the Peloponnesian War reveal an inherent flaw in Greek society?

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The Peloponnesian War revealed the inherent flaw in Greek society of the independent poleis fostering rivalry and mistrust among neighbors. The city-states pursued their own interests and were not willing to compromise or cooperate, leading to conflicts that eventually escalated into the devastating Peloponnesian War. This competition and lack of unity among Greeks weakened them, and made them vulnerable to invasion and conquest by outside powers.

How Does the Peloponnesian War Reveal an Inherent Flaw in Greek