Don't forget the Corinthian War and the rise of the Second Athenian Empire in the 4th Century. True, the Peloponnesian War did kill off a generation within the Hellenic world. But I sometimes think that arguments like "the Peloponnesian War left an opening for Phillip II and Macedon" are over stated (accurate, but overstated). In my view, the military revolution that occurred during the 27 year long war between Athens and Sparta resulted in faster, lighter troops, and a more unified force of heavy infantry, skirmishers, and cavalry. I think we can see a shadow of the lessons learned during the Peloponnessian War in the army Phillip used to defeat the Greek Cities decades later.
To answer the initial question: Sparta won the war but lost the peace. Safe bets are on Thebes and Corinth (in that their position relative the other cities had increased the most).
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