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Archduke and his wife were assassinated while visiting Sarajevo, Bosnia. He was next in line for the Austro-Hungarian throne. The killings set off decades old tensions in Europe and started WWI.
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Gavrilo Princip was a Bosnian Serb member of Young Bosnia, a Yugoslavist organization seeking an end to Austro-Hungarian rule in Bosnia and Herzegovina
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The Battle of the Marne was a World War I battle fought from 6–10 September 1914. It resulted in an Allied victory against the German armies in the west
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Know Your World War I Chemical Weapons. Three substances were responsible for most chemical-weapons injuries and deaths during World War I: chlorine, phosgene, and mustard gas. ... Although the Germans were the first to use phosgene on the battlefield, it became the primary chemical weapon of the Allies.
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The sinking of the Cunard ocean liner RMS Lusitania occurred on Friday, 7 May 1915 during the First World War, as Germany waged submarine warfare against the United Kingdom which had implemented a naval blockade of Germany. The ship was identified and torpedoed by the German U-boat U-20 and sank in 18 minutes.
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The Battle of Verdun, fought from 21 February to 18 December 1916, was the largest and longest battle of the First World War on the Western Front between the German and French armies
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was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the prior event of the United States entering World War I against Germany.
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On April 2, 1917, President Woodrow Wilson went before a joint session of Congress to request a declaration of war against Germany. ... The United States later declared war on German ally Austria-Hungary on December 7, 1917.
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World War I, also known as the First World War, the Great War, or the War to End All Wars, was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918
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The Treaty of Versailles was the most important of the peace treaties that brought World War I to an end. The Treaty ended the state of war between Germany and the Allied Powers
