How did the creation of the Delian League indicate a major change in Ancient Greek politics?​

The Delian League was founded in 478 BCE following the Persian War to be a military alliance against any enemies that might threaten Ionian Greeks. It was led most notably by Athens, who protected all members unable to protect themselves with its massive and powerful navy.

The Delian League was formed to continue fighting the Persian Empire after Persia's invasions were finally defeated. ... In 454 BC, Pericles moved the treasury of the Delian League from Delos to Athens. This proved that Athens completely controlled the Delian League, and effectively began the Athenian empire

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