Why did Athens create the Delian League after the Persian invasions?

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Greco-Persian Wars The Battle of Salamis (480 bce), in which Greece gained an uncontested victory over the Persian fleet.

Following the Persian invasions, Athens established the Delian League in 478 BCE as a confederacy of Greek states. While the league was officially presented as a defensive alliance to protect Greeks from the Achaemenian Persia, Athens had several strategic motivations for its creation:

Defense and Security: The primary stated purpose was to provide collective security for Greek states against future Persian aggression.1
Supporting Ionians: Athens sought to provide ongoing support to the Ionians living in Anatolia, who remained vulnerable to Persian influence.1
Retribution: Athens aimed to exact retribution from the Persians for the destruction caused during the invasions.1
Leadership: Because Sparta was reluctant to commit to long-term military operations overseas, Athens stepped into the leadership role, supplying the commanders and controlling the league's treasury and strategic decisions.1

Over time, this alliance evolved into an Athenian empire, as Athens increasingly used the league's resources to serve its own political and military interests.1