The primary cause of the Peloponnesian War was the internal conflict between Athens and Sparta. The rivalry and differing political systems of the two powerful city-states led to increasing tensions and ultimately war, making "Internal conflict between Athens and Sparta" the correct response.
What caused the Peloponnesian War? (1 point) Responses Internal conflict between Athens and Sparta Internal conflict between Athens and Sparta Economic disputes among Greek city-states Economic disputes among Greek city-states Invasion by a foreign empire Invasion by a foreign empire Religious differences within Greece
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