What was the cause of the Peloponnesian War?

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Athens's use of the Delian League's treasury was a major cause of the Peloponnesian War. The Delian League was formed in 478 BC to provide for the defense of Athens and her allies from Persian attacks. Over time, Athens began to use the League's treasury for its own purposes, such as rebuilding the Acropolis and funding its imperialist policies. This led to resentment from other Greek city-states, particularly Sparta, which saw Athens's actions as a threat to its own power and influence. The tension between Athens and Sparta eventually escalated into war in 431 BC, marking the beginning of the Peloponnesian War.

What Was the Cause of the Peloponnesian War