The Peloponnesian War (431-404 B.C.E.) was a conflict between Sparta (Thebes and Corinth) and Athens (Delian League) The warfare began in the aftermath of the Greco-Persian War. Athens amassed great power and Sparta became increasingly jealous. The war led to the defeat of Athens. Athens was left without resources and humiliated. Sparta took over the Athenian state and its tribute revenues. For a time, Athenian democracy was suspended.
The causes of the Peloponnesian war are that the Athenian Empire upset the balance of power in the Greek world this alarmed Sparta and its allies
It ended when the Athens surrendered after the war sparta was ruling the state of Greece
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