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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 -
After weeks of speculation and mounting tension, Great Britain declared war on Germany on 4 August 1914. -
On May 7, 1915, the German submarine (U-boat) U-20 torpedoed and sank the Lusitania, a swift-moving British cruise liner traveling from New York to Liverpool, England. Of the 1,959 men, women, and children on board, 1,195 perished, including 123 Americans. -
On this day the United States declared war on Germany. They allied with France, Britain, Canada, Russia, New Zeeland, and Bulgaria. -
The Versailles Peace Treaty, signed on June 28, 1919, officially ended World War I. The same day 5 years later the war ends. -
Woodrow Wilson had been re elected by narrowly beating Charles Evans Hughes. -
On this day a blast at a munitions factory in London killed 73 and injured of 400. -
Shock troops with the Austro-Hungarian Army pushed 11 Italian divisions off the Mount Ortigara summit. Italy suffered 23,000 casualties while Austria-Hungary sustained only 9,000 casualties. -
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. -
On November 11, 1918 an armistice was signed between the Germans and the Allies, ending World War I.