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Archduke Franz Ferdinand is assassinated in Sarajevo. His death is the event that sparks World War I.
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Germany invades Belgium, beginning World War I.
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After Germany invades Belgium
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U.S. President Woodrow Wilson announces the U.S. will remain neutral.
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The beginning of trench warfare.
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The Germans fire shells filled with chlorine gas at Allied lines. This is the first time that large amounts of gas are used in battle.
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A German submarine sinks the passenger liner Lusitania. The ship carries 1,198 people, 128 of them Americans.
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This was the longest battle of World War I, it also had some of the most fatalities out of any battle.
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During the Battle of the Somme, tanks are first introduced.
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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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Germany resumes unrestricted submarine warfare.
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Congress authorizes a declaration of war against Germany. The United States enters World War I on the side of France and Britain.
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Congress passes the Selective Service Act authorizing the draft,
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The Bolsheviks successfully overthrow the Russian government during the 1917 Russian Revolution.
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President Woodrow Wilson issues his Fourteen Points to peace.
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The Germans sign a peace treaty with the new Bolshevik government of Russia.
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It is a peace treaty between Russia and the Central Powers.
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The Battle of Cantigny is the first major American offensive of the war.
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The eleventh hour, of the eleventh day, of the eleventh month. The Treaty of Versailles was signed, declaring the end of the war. This is also known as Armistice Day
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