The time that Athens led a group of city-states was after the end of the Persian Wars.
After the end of the Persian Wars, Athens and Sparta became the most powerful Greek City-states and they led different groups of city-states.
The Athenians led the Delian League which was comprised of over a hundred states and prioritized a strong navy.
Find out more on the Delian League at https://brainly.com/question/4248555.
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