Why did athens originally from the delian league

The Delian League, founded in 477 BC, was an association of Greek city-states, members numbering between 150 173, to 330 under the leadership of Athens, whose purpose was to continue fighting the Persian Empire after the Greek victory in the Battle of Plataea at the end of the Second Persian invasion of Greece.

The Delian League, founded in 477 BC, was an association of Greek city-states, members numbering between 150 173, to 330 under the leadership of Athens, whose purpose was to continue fighting the Persian Empire after the Greek victory in the Battle of Plataea at the end of the Second Persian invasion of Greece.