I triggered suspicion among allies, my revelations shifted alliances, and I unfolded in hidden rooms far from battlefields. What am I?

Category: History · Difficulty: expert

Hint: Look for a secret message that helped draw a neutral power into war

Answer

The Zimmermann Telegram

Explanation

This intercepted message promised support for an alliance, provoking the United States' entry into World War I.

This is a expert history riddle — one of the harder riddles here. The answer is The Zimmermann Telegram.

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