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

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The Peloponnesian War, fought between Athens and Sparta along with their respective allies, highlighted the deep divisions and rivalries between the independent city-states (poleis) of Greece. This fragmentation and lack of unity made collective action difficult and often led to internal conflicts, undermining the stability and security of Greek society as a whole.

How Does the Peloponnesian War Reveal an Inherent Flaw in Greek