After defeating the Persian, Athens grew in power and wealth, so other city states kept eye on them especially the Sparta. Spartan were jealous and fear about the growth of Athens. However, both the city states believed that their own city state had more advantages over other and both the leader pressed for war. Finally, Spartan declared war on Athens on 431BC. Athens have stronger navy and Spartan had stronger army.
After defeating the Persian, Athens grew in power and wealth, so other city states kept eye on them especially the Sparta. Spartan were jealous and fear about the growth of Athens. However, both the city states believed that their own city state had more advantages over other and both the leader pressed for war. Finally, Spartan declared war on Athens on 431BC. Athens have stronger navy and Spartan had stronger army.