Sparta and its allies and Athens and its allies fought for domiance. The Spartan side won with Persian assistance.
Athens and Sparta vied for hegemony for commercial reasons ~ Look to the related link below for additional information .
The two sides fought off and on for 27 years.
Most of the Peloponnesian city-states.
Sparta .
During the Peloponnesian war.
The Peloponnesian War was fought during the years 431-404 BCE.
Melos
The advantage that Athens had during the Peloponnesian wars was that they had a bigger army. They also had a larger Navy.
Sparta and its allies.
Sicily.
plato
By sea.
We call it the Peloponnesian War today because it was between the Athenian Empire and the Peloponnesian League, of which Sparta was a member and leader. At the time, they referred to it the war between Sparta and its allies and Athens and its allies.
Peloponnesian War happened in -431.