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When did the United States declare war on Germany in World War I?
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World War I
A British soldier inside a trench on the Western Front during World War I, 1914–18.
The United States officially declared war on Germany on April 6, 1917.123
Following the German resumption of unrestricted submarine warfare and the revelation of the Zimmermann Telegram, President Woodrow Wilson addressed a joint session of the U.S. Congress on April 2, 1917, to request a declaration of war. After the Senate and the House of Representatives approved the war resolution, President Wilson signed it into law on April 6, formally recognizing that a state of war existed between the United States and the German Empire.1234