Which of these was a trigger for the American entry into World War I?

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The Zimmerman telegram, in which Germany attempted to entice Mexico into joining the war on their side and attacking the United States, was a significant trigger for the American entry into World War I. It was seen as a direct threat to national security and outraged the American public, leading to a shift in public opinion and ultimately a declaration of war.

Which of These Was a Trigger for the American Entry