What was the main cause of the U.S. entering World War I? 🔊
The main cause of the U.S. entering World War I was the unrestricted submarine warfare practiced by Germany, particularly following the sinking of the Lusitania in 1915, which killed American passengers. Additionally, the interception of the Zimmermann Telegram in 1917, in which Germany proposed a military alliance with Mexico against the U.S., further inflamed tensions. These events, combined with economic interests in supporting the Allies and the ideological drive to make the world "safe for democracy," led President Woodrow Wilson to ask Congress for a declaration of war against Germany in April 1917.


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