What was the main reason the Persians went to war with Greece?

The Persian wars against Greece were caused because the 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 on which caused the series of wars.

1 a

2 c

3 c

4 b

5 a

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the decreasing neutrality of the u. s. in world war i

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