How did the Athenian government change after the Peloponnesian War?

After Athens lost the Peloponnesian War in 404 BCE, Sparta backed a small group of Athenian elites known as the Thirty Tyrants. They replaced the democracy with an oligarchy, where a few people held power. Athens later restored its democracy, but the immediate change after the war was rule by a few.

AI-written and checked against the verified answer.