What crisis threatened the Greek polis and is believed to have led to the revolutionary changes in Greek philosophy?

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The Peloponnesian War was a major crisis that threatened the Greek polis and led to revolutionary changes in Greek philosophy. The war lasted for 27 years and resulted in the downfall of Athens as a military and political power. This led to a period of instability and uncertainty, which in turn inspired philosophers like Plato and Aristotle to explore new ideas about politics, ethics, and human nature. The war is considered to be a turning point in Greek history, marking the end of the classical era and the beginning of the Hellenistic period.

What Crisis Threatened the Greek Polis and Is Believed to Have