Initially the city-states put their disputes on hold until they had driven back the Persian attempt to bring them under control, but when the Persian threat was repelled, the were free to go back to their usual wars between each other with renewed ferocity.
yes they did
Persian War.
Xerxes I.
Herodotus
499 BCE
Persia lost.
NO! The Persian war was ancient Greece vs the Persians USA didnt even exist then.
The Persian War
The outcome set a limit to Persian expansion to the west.
The Persian invasion of peninsular Greece 480-479 BCE.
Which society?
Historians today think the 1st Persian war started around 490 BC.