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June 28, 1914
Archduke Franz Ferdinand of Austria, heir to the Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo -
August 4, 1914
Great Britain declared war on Germany -
May 7, 1915
The German submarine (U-boat) U-20 torpedoed and sank the Lusitania -
November 7, 1916
Presidential elections were held in the United States. Incumbent Democratic President Woodrow Wilson narrowly defeated former associate justice of the Supreme Court Charles Evans Hughes, the Republican candidate. -
January 19, 1917
British naval intelligence intercepted and decrypted a telegram sent by German Foreign Minister Arthur Zimmermann to the German Ambassador in Mexico City. -
April 6, 1917
The United States formally declared war against Germany and entered the conflict in Europe. -
June 25, 1917
The first American troops land in France. -
November 11, 1918
On November 11, 1918 an armistice was signed between the Germans and the Allies, ending World War I. -
May 16, 1918
The Sedition Act of 1918 was enacted on May 16, 1918 to extend the Espionage Act of 1917. The Sedition Act covered a broader range of offenses, notably speech and the expression of opinion that cast the government or the war effort in a negative light or interfered with the sale of government bonds. -
June 28, 1919
The Versailles Peace Treaty, signed on June 28, 1919, officially ended World War I.