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.

the virginia plan called for three branches of government and two houses of congress. representation in each house would be determined by population. the new jersey plan called for three branches of government and a single house of congress. each state would have an equal vote.

the commander in chief