What caused the Persian Wars to begin?

The catalyst for the first Persian war stemmed from a revolt by Greek Ionians. It was instigated by Aristagoras, economic burdens, and a feeling of being treated unfairly by the Empire. Athens came to the Ionians aid. During the rebellion, one of the Persian capital cities, Sardis, was burned.

Explanation:

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the triple alliance. germany and austria-hungary were already allies by 1879 when, worried about a threat from russia, they formed the dual alliance. italy joined the group in 1882. there was a concern about a possible attack from france and the alliance needed powerful friends to defend it.