What were the impacts of Grco-Persian war?

Answer 1

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.

With this strength behind it, it began to impose itself on other cities outside its empire, which brought it into war with the Peloponnesian League led by it's ex-ally Sparta. The result was a 27-year war which devastated the Greek world which Athens lost and was stripped of its empire. Sporadic fighting between the Greek cities continued which gave Macedonia the opportunity to dominate a weakened Greece.