What were the main reasons for the Peloponnesian War?

The main reason for the outbreak of the war between Athens and Sparta was the Athenian naval union, which included all the other Greek city-states. This alliance was especially beneficial during the war. True, in the non-war period, all contributions to the union were taken by Athens, which was not acceptable for other policies. Also, disputes arose between the policies over trade routes, which also served as the reason for the resolution of the conflict. Thus, the Peloponnesian Wars began.

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