Long ago, many Greek cities joined together. 
Long ago, many Greek cities joined together. 

Long ago, many Greek city-states joined together. 


Over time, things began to change. Athens used the money to build more ships. They also used the funds to make their own city beautiful. In 454 BC, Athens moved the money to their own city. This made the other cities feel less free. Athens began to rule the members like an empire. Some cities tried to leave, but Athens used force to stop them. This tension led to the Peloponnesian War in 431 BC. The League ended when that war was over in 404 BC.
The Delian League was a large group of Greek city-states. 

Members of the League had to make important choices. They could choose to send their own soldiers to fight. Most cities chose to pay money instead of sending troops. This money went into a shared treasury to pay for wars. To show they were loyal, members swore a special oath. They even dropped iron ingots into the sea to show their bond. This helped the group stay organized and ready for battle.
Athens became the leader of the whole League. While Sparta was strong on land, Athens was a power at sea. 
Between 150 and 330 city-states were part of the League.
The League was very successful at first in its main mission. It helped push the Persian forces out of the Aegean Sea. This meant Persia was not a huge threat for fifty years. However, the power of Athens caused tension with other groups. This tension helped start the Peloponnesian War in 431 BC. The League finally dissolved in 404 BC when the war ended. Later, Athens tried to start a Second Athenian League to regain power.
The Delian League was a powerful confederacy of ancient Greek city-states. 
To understand how the League worked, we must look at its organization. The members were required to swear an oath of loyalty to the coalition. To symbolize this permanent bond, they dropped iron ingots into the sea. 
Athens emerged as the leader, or hegemon, of the League. While the city of Sparta was the greatest power on land, Athens focused on the sea. Athens became the dominant naval power in the Greek world. This leadership began after the Spartan military withdrew from the conflicts with Persia. The League was officially named after the island of Delos. This island served as the meeting place for the congresses held within the sanctuary of the Temple of Apollo. 
The history of the League is tied to the Greco-Persian Wars. The Persians had previously invaded Greece, leading to famous battles like Marathon and Salamis. After the Greeks won the Battle of Plataea in 479 BC, the threat from Persia seemed to fade. However, the Greeks wanted to ensure the Persians could not return. The Delian League was created to continue the fight and avenge previous wrongs. By successfully expelling Persian forces from the Aegean, the League ensured Persia would not be a major threat for fifty years.
The League's power grew through its massive membership and wealth. At its height, the League included between 150 and 330 different city-states. 
Athens used the collected funds for many different purposes. They used the money to reinforce their naval supremacy and build beautiful architecture. This use of shared money caused great tension. Some allies even attempted to rebel, such as the city of Thasos in 465 BC. When cities tried to leave the League, Athens often used its military to force them to stay.
The Delian League eventually came to an end due to these rising tensions. The war between Athens and Sparta lasted many years. The League was finally dissolved in 404 BC under the direction of the Spartan leader Lysander. Later, in the 4th century BC, Athens tried to rebuild its influence. They created a new group called the Second Athenian League. This new alliance helped Athens regain its naval dominance in the eastern Mediterranean, though the original Delian League remained a unique chapter in Greek history.
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