Final answer:
The sinking of the 'Lusitania' and resumption of unrestricted submarine warfare were causes of US entry into WWI, not the Zimmerman Note.
Explanation:
The Zimmerman Note in 1917 was NOT a cause of the US entry into World War I in 1917. The sinking of the Lusitania in 1915 and the resumption of unrestricted submarine warfare in 1917 were key events that led to the US declaring war. The Zimmerman Note, intercepted in January 1917, revealed Germany's scheme with Mexico but did not directly cause the US entry into the war.
Learn more about US entry into World War I here:
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