What's the significance of the Zimmerman telegram? A. it triggered the sinking of the Lusitania

B. It resulted in Mexico declaring war against the United States

C. It resulted in the United States entering World War I

D. It officially ended Russia’s involvement with World War I

C

Explanation:

The Zimmerman telegram was basically Germany telling Mexico, "Hey, if you attack the United States, we guantee you will get back California, Texas, New Mexico, and Kansas. We'll send you money and resources."

Then the United States was like, "Uh uh, honey. We don't deal with that" and they joined the Great War (WWI)

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