What was the problem that led to the start of the Persian Wars?

The Persian Wars began in 499 BCE, when Greeks in the Persian-controlled territory rose in the Ionian Revolt. Athens, and other Greek cities, sent aid, but were quickly forced to back down after defeat in 494 BCE. Subsequently, the Persians suffered many defeats at the hands of the Greeks, led by the Athenians.

Explanation:

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.

Explanation:

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