The Peloponnesian War contributed to the expansion of Macedonia by weakening the great Greek City-states.
The Peloponnesian war saw the Spartans go up against the Athenians. Both of these city-states were the strongest in Greece at the time.
The war resulted in Athens' defeat but also weakened Sparta to the point where it was defeated by Thebes several decades later. This allowed the Macedonians to steadily take over Greece because the great city-states weren't strong enough to resist.
Find out more on the Peloponnesian war at https://brainly.com/question/731168.
