Many city states formed an alliance against Athens because they felt the Athenian's treated them as mere subjects. Athens is the capital of Greece.
They wanted to punish the persians for attacking Greece
Athens.
Athens.
Athens and its allies and Sparta and its allies.
The alliance of Greek city-states under the leadership of Athens was called the Delian League. Established in 478 BCE, it was formed primarily to continue the fight against Persia after the Persian Wars. Member states contributed ships and money, with the league's treasury initially located on the island of Delos. Over time, Athens became increasingly dominant, leading to tensions with other city-states and contributing to the outbreak of the Peloponnesian War.
Athens turned the league which it led against the Persian Empire into an empire of its own. Using the power of this empire to bully other city-states. The Peloponnesian League led by Sparta called Athens on its attempt to bankrupt its neighbour Megara, a member of their league, an overconfident Athens persisted, resulting in a destructive war which Athens lost, and was stripped of its empire.
Athens turned the league which it led against the Persian Empire into an empire of its own. Using the power of this empire to bully other city-states. The Peloponnesian League led by Sparta called Athens on its attempt to bankrupt its neighbour Megara, a member of their league, an overconfident Athens persisted, resulting in a destructive war which Athens lost, and was stripped of its empire.
At Ephesus in 498 BCE the Persian army crushed a force of the Ionian cities augmented by contingents from Eretria and Athens.
It was based on 180 city-states in Asia Minor and the Islands which banded together against the Persian Empire under the leadership of Athens. When the Persian threat was resolved, opportunistic Athens converted it into an empire of its own.
The alliance of 140 city-states was known as the Delian League. Formed in 478 BCE, it was a coalition of Greek city-states led by Athens, originally established to continue the fight against Persian aggression following the Greco-Persian Wars. The league later transformed into an Athenian empire, with member states contributing ships or money for mutual defense and support.
The first political system in the city-states of Greece was the rule of one man [kingdome]. Then aristocracy/ oligarchy followed and finaly democracy was introduced with Athens as the leading city. Athens strongly supported other cities to join the democratic alliance known as the athenean alliance.