Question 101
The 1900s
Why did the United States enter World War I?

The United States entered World War I in 1917 because Germany attacked U.S. civilian ships, sinking them and killing U.S. citizens. President Wilson also wanted to support the Allied Powers against the Central Powers and “make the world safe for democracy.” 

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Section "Learn and Explore" uses official instructions and media files of US Citizenship and Immigration Services, US National Museum of American History, The Smithsonian Institution and other governmental and public organization.