What was the most significant effect of the peloponnesian War?

The Peloponnesian War was fought between the Athens and Sparta. This was the war that opened a new dimension and reshaped the old Greek World and society. This was the war that destroyed Athens which was the largest Greek empire before the start of the war. This war created a cost rise all across Greece and this resulted in large scale poverty while Athens was never able to regain the prosperity prevalent before the war. This was also the war that gave birth to numerous civil wars across the greek Empire.