Answer:
Who fought in the Peloponnesian War?
Athens and Sparta.
Who won?
Sparta.
Explanation:
The Peloponnesian War took place in Ancient Greece and was fought by the Peloponesian League, from Sparta, and the Delian League, from Athens. Sparta and Athens were two great city-states, and the root cause of the war was Sparta's fear of Athens's growing power. The war lasted for almost half a century, and Sparta was the winner in the end. Athens was subjected to Sparta's terms, and the whole country felt the devastating effects of the war.
