Why did the different Greek communities form the Peloponnesian League?

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Explanation:

why did different Greek communities form the peloponnesian league? the Spartans were overthrown by Perasia and so were other people but they were ruined from the Battle of Thermopylae which led many city-states the form league.

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disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.