One thing was strife between the city-states. This continued on after the persian wars.
First Sparta, then Thebes, then Macedonia.
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 Delian League led by Athens and the Peloponnesian League led by Athens.
The Spartan alliance dominated mainland Greece, while the cities in Asia Minor remained within the Persian empire without Athens; protection.
yes they did
Persian War.
Xerxes I.
Amphibious battles around the eastern Mediterranean Sea.
Herodotus
499 BCE
Persia lost.
NO! The Persian war was ancient Greece vs the Persians USA didnt even exist then.