What was the purpose of the Delian League?

to unite the city-states for protection

to provide one government

to increase trade

to establish a school system

The Delian League, founded in 478 BC, was an association of Greek city-states, with the number of members numbering between 150 and 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.