The Persian wars against Greece were caused because Darius, the Persian king, wanted to expand their empire. The wars took place in the early 5th century B.C. but the first attack was around 490 B.C. but the Persians lost. King Darius was humiliated and wanted to continue which caused the series of wars. Athens also sent ships to help the Ionian city-states fight the Persians
Explanation:
Darius, the Persian king, had vowed to Athens and Eretria for their support for the revolt.
