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Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo on 28 June 1914.
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Great Britain declares war on Germany, The declaration binds with the British Empire. This includes Canada, Australia, New Zealand, India, and South Africa
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A German U-Boat torpedoes the British passenger liner Lusitania off the Irish coast. It sinks in 18 minutes, drowning 1,201 persons, including 128 Americans. President Woodrow Wilson subsequently sends four diplomatic protests to Germany.
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American voters re-elect President Woodrow Wilson who had campaigned on the slogan, "He kept us out of war."
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British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmerman to the German Ambassador in Mexico City.
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The United States declares war on Germany
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The First American troops land in France
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The Sedation Act of 1918 was enacted on May 16, 1918 to extend the Espionage Act of 1917.
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an armistice was signed between the Germans and the Allies, ending World War I.
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At the Palace of Versailles in France, a German delegation signs the Treaty formally ending the war.