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Persians Empire Conquered Ionia an area of Greek colonies.

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494 B.C. The Persian emperor Darius I vowed to punish Athens as revenge for helping Ionia.

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490 B.C., the Persian army landed at Marathon, just over 24 miles east of Athens.

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480 B.C., hundreds of Persian ships and more than 150,000 soldiers went on the attack.Athens had forged strong alliances, or partnerships, with other Greek city-states, including Sparta.

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479 B.C., a large and united Greek army 

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479 B.C., a large and united Greek army 

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479 B.C., a large and united Greek army finally defeated the Persians at the Battle of Plataea. After this, the Persians left Greece and never invaded again.

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Athens and Sparta emerged triumphant as the most powerful city-states in Greece.