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The United States declared war on the German Empire on April 6, 1917, nearly three years after World War I started. A ceasefire and armistice were declared on November 11, 1918.
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- World War I Begins. On June 28, 1914, Archduke Franz Ferdinand, heir to the throne of the Austro-Hungarian Empire, and his wife, Sophie, were assassinated by a Bosnian Serb nationalist in Sarajevo, the capital of the Austro-Hungarian province of Bosnia and Herzegovina.
- The Lusitania Sinks. On May 7, 1915, a German submarine sank the British ocean liner Lusitania, resulting in the deaths of nearly 1,200 people, including 128 Americans.
- Germany’s U-Boat Submarine Warfare Resumes. In March 1916, a German U-boat torpedoed a French passenger ship, the Sussex, killing dozens of people, including several Americans.
- The Zimmerman Telegram. Meanwhile, in January 1917, the British intercepted and deciphered an encrypted message from German Foreign Minister Arthur Zimmermann to the German minister to Mexico, Heinrich von Eckhart.
Why did America enter World War I? When WWI began in Europe in 1914, many Americans wanted the United States to stay out of the conflict, supporting President Woodrow Wilson’s policy of strict and impartial neutrality.
American entry into World War I. U.S. President Woodrow Wilson announces the break in official relations with the German Empire in an address to the U.S. Congress on February 3, 1917. The United States entered into World War I in April 1917, more than two and a half years after the war began in Europe. Apart from an Anglophile element urging ...
From Naval History and Heraldry Command. An interactive World War I timeline of events with descriptions, videos, and photos.
After nearly three years of horrific, industrialized war raged across Europe and repeated German effrontery, the United States dropped its neutral stance and joined the fight in April 1917....
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4 days ago · World War I - US Entry, Causes, Impact: The U.S. declared war on Germany after U-boats sank three U.S. merchant ships. The March Russian Revolution led to the end of imperial Russia, and the October Revolution of the Bolsheviks ended Russia's role in the war when they signed the treaty of Brest-Litovsk.
