The Zimmermann Telegram added to the U.S.'s reasons for war because it offered a German alliance to Mexico along with a promise to the latter to regain the now-American lands of Texas, Arizona, and New Mexico.
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Well I don't see any options so my guess would be:
Don't pick any opinions because if your writing a research paper then you should have your paper based off of facts and things you have seen off of the internet.
Hope this helps and Have a wonderful day!
Sweden, Finland, Scandinavian countries such as Denmark-Norway