How did the athens and sparta contribute to the defeat of the persians?

Initially the Persians won several battles. Only in 490 B.C. did the Greeks achieve victory over the Persians. After battle they managed to expel the Persians in Marathon. It was only ten years later that Xerxes, son of Darius I, organized a major invasion of Greece. In this scenario the Greeks lost some battles again, but, temporarily managed to stop the Persian invasions and for their defense they created an Alliance that was able to unite the different Greek peoples and protect them from Persian attacks. The League of Delos had Delos as its host city, but it consolidated the power of Athens, already threatened with a new Persian invasion.

The war ended with the Greek victory but the rise of Athens among the Greeks and the discontent of Sparta led to the creation of an alliance that opposed Lida de Delos, the Peloponnese League, and which generated the dispute between the two main Greek cities Sparta and Athens, who faced each other in the Peloponnesian War.

the answer is option a.

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