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Zimmerman Telegram, sinking of the Lucitania, and German aggression. There were two primary reasons that the United States entered into World War I: The Sinking of the Lusitania, and the intercepted Zimmerman telegram. Let's start at the sinking of the Lusitania. It was carrying 128 Americans onboard, despite German threats of sinking any ship that came into their waters. In fact, they actually took out a full page ad in an American news paper and warned the United States to not board the Lusitania. In 1917, Germany warned the entire world of submarine warfare. Next, the Zimmerman telegram was intercepted by the United States. It detailed a plan to keep America neutral, but offered an alternative should this not prove to be the case--making a deal with Mexico to help them regain lost territory to the United States. This scared Americans to death and with their fear came their demands for war.

Thus, America enters the war (near the very end, mind you), and tips the scale of the stalemate. If I had to choose which one was more prominent, I'd have to say the Zimmerman telegram. Hope this helps, Alex

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Q: The principale reason for US entry into world war 1?
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