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Why did the United States enter World War I?

Can you please list reasons the United States entered World War I?

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The United States entered World War I for several reasons. Americans were upset by the sinking of the Lusitania and the Sussex, both carrying US citizens, by German submarines. In his campaign of 1916, President Wilson had promised Americans that he would maintain freedom of the seas. This eventually led to direct US involvement in the war in order to stop German subs, which were ignoring the US's position of ...