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.” 

Other questions related to The 1900s
The 1900s
What was the Great Depression?
QUESTION #103
The 1900s
Who did the United States fight in World War II?
QUESTION #106
The 1900s
When did all women get the right to vote?
QUESTION #102

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.