In the latter stages of the 50-year long War, Athens led the Delian League of 180 city-states. After peace was arranged, it converted the League into an empire.
Pelopponesian war, fought between Sparta and her alllies, and the Athenian Empire
The Peloponnesian War (490 B.C.) destroyed the Athenian Empire.
The Athenian empire/alliance.
The growth of Athenian power was based on war.
The Athenian Empire was more commonly called the Delian League. It dissolved in 404 BC at the end of the Peloponnesian War. There is a link below.
The two groups that fought in the peloponnesian war are Athenian Empire (Delian League), lead by Athens and Peloponnesian League, which is lead by Sparta eventually, Sparta won the war
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Aggressivenes of the Athenian empire which interfered in inter-city disputes outside the empire.
There was one Peloponnesian War, won by the Peloponnesian League over the athenian empire.
Wars don't have roles. They happen and have outcomes. The Peloponnesian War was between the Athenian empire and the Peloponnesian League, which Athens lost and lost its empire.
Rivalry between the Athenian empire and the Peloponnesian League led by Sparta, culminating in Athens imposing a ruinous trade ban on the Peloponnesian city of Megara and refusing to rescind it.
A struggle between the Athenian empire/league and the Spartan-led Peloponnesian League.