Question

What happened before the Peloponnesian War that made it happen?

Answer 1

Answer:

The Athenian empire power and influence was growing too rapidly, Sparta saw them as a threat and wanted to get rid of them causing the build up of how badly Sparta wanted to go to war, and the immediate trigger for that was when the Anthenian empire tried to take control of the league which would create a powerful naval alliance.

Explanation:

another words they both had different plans and it created war