because they thought they were both better than each other
The Peloponnesian war which stared at 431 BCE and lasted until 404 BCE. The Spartans won this war but could not exploit the benefits of their victory as they were too weak to re establish the state...
Sparta used rayguns while athens used ak47's and everyone knows rayguns are more powerful ten ak47's
Peloponesian war
id Sparta and Athens get to war?