The Delian League led by Athens and the Peloponnesian League led by Athens.
One thing was strife between the city-states. This continued on after the persian wars.
First Athens, then Sparta, then Thebes until Macedonia took over.
No one. Athens organised its empire in the aftermath of the Persian invasion. Sparta minded its own business. None of the other city-states were in a position to dominate anyone.
The coalition of Greek city-states was.
A confederation of Greek city-states.
The Persian invasion.
Athens.
The first Persian invasion of Greece was during the Persian Wars in 492 BCE. It was ordered by the Persian King Darius I to punish the city-states of Athens and Eretria.
The Ionian city-states revolted against Persian rule and this progressively brought mainland Greece into the conflict.
Xerxes son of Darius
The Greek city-states which did not side with Persia.
Greek city-states within the Persian Empire in Asia Minor were induced to revolt against Persian rule, and it expanded to include mainland Greece.