they did not treat the other city states fairly . then the city states asked Sparta for help and Sparta did help causing the Peloponnesus Wars .
first Sparta caused a plague or a wide spread decease . which whom many Athenians died from including Pericles .
then the formed a blockade so the Athenians finally surrendered .
thank you i hoped this answered your question and it helped what so ever . 🙂

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