• 06/28/1914

    Austro-Hungarian throne and his wife Sophie, Duchess of Hohenberg were assassinated in Sarajevo
  • 07/28/1914

    Austria-Hungary declares war on Serbia, effectively beginning the First World War.
  • 08/4/1914

    Great Britain declared war on Germany at 11:00 p.m. for violating Belgian neutrality.
  • 5/7/1915

    the British ocean liner Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland.
  • 11/7/1915

    France lost 48,320 casualties while Great Britain lost 61,713.
  • 1/19/1917

    The British intercept a telegram sent by Alfred Zimmermann in the German Foreign Office to the German embassies in Washington, D.C., and Mexico City.
  • 4/6/1917

    the United States formally declared war against Germany and entered the conflict in Europe.
  • 6/25/1917

    The Nivelle Offensive in April and May had failed to achieve its more grandiose aims, had led to the demoralisation of French troops and confounded the Anglo-French strategy for 1917.
  • 11/11/1918

    Although fighting continued elsewhere, the armistice between Germany and the Allies was the first step to ending World War I.
  • 6/28/1919

    Germany and the Allies signed the Treaty of Versailles, formally ending World War I and providing for the creation of the League of Nations.