Answer:
The Peloponnesian War
Step-by-step explanation:
One of the effects of the Delian League was the Peloponnesian War. The Delian League was an association of Greek city-states that was originally formed in order to fight against the Persian Empire. However, soon Athens began using the league as a way to fund its own purposes. The control that Athens had over the league prompted the outbreak of the Peloponnesian War.