I sparked a global contest from a secret code, my unveiling led to decades of spies and distrust. What am I?

Category: History · Difficulty: expert

Hint: Look for a cryptic message that pulled one nation into a larger war

Answer

The Zimmermann Telegram

Explanation

The intercepted diplomatic communication promised an alliance that drew the U.S. into World War I, intensifying global conflict.

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

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