Question

What was a significant effect of the Greco-Persian Wars?

Answer 1

Hey there,
The significant effect of the Greco-Persian Wars was that Athens emerged as the most powerful of the victorious Greek city-states, leading to a Golden Age of peace and prosperity. 

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Answer 2

Later in the war Athens assumed leadership of an anti-Persian coalition of a couple of hundred Greek cities we call the Delian League. When peace was made with the Persian Empire, Athens converted this League into an empire of its own, and used it's funds for it's own benefit. 
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