What were the effects of the Persian War in Greece?

Answer 1

After the Persians agreed to peace, Athens converted the Delian League which it had led in the second half of the war into an empire of its own. It used this strength to interfere in the affairs of other Greek cities, resulting in the devastating 27-year Peloponnesian War, which saw Athens stripped of its empire. The weakened cities were then taken over into a Macedonian Empire.

Answer 2

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.

Answer 3

It ended Persian attempts to control Greek war-making, leaving the Greek city-states to increasingly destructive wars with each other.