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Archduke Fran Ferdinad & wife sophie were shot at Sarajevo by Gavrilo Princip. One of a group of six Bosnian Serb assassins. http://en.wikipedia.org/wiki/Assassination_of_Archduke_Franz_Ferdinand_of_Austria
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one month to the day after Archduke Franz Ferdinand of Austria and his wife were killed by a Serbian nationalist in Sarajevo, Austria-Hungary declares war on Serbia, effectively beginning the First World War. http://www.history.com/this-day-in-history/austria-hungary-declares-war-on-serbia
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First Truly Global War
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The United Kingdom declares war on Germany, after Germany invades Belgium.
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Germany declares a "war zone" around Great Britain, essentially effecting a submarine blockade where even neutral merchant vessels were to be potential targets. http://history1900s.about.com/od/1910s/a/World-War-1-Timeline.htm
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The British ocean liner RMS Lusitania is sunk by German U-boat, U-20
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The Battle of Verdun begins. The Battle of Verdun was the longest battle of World War 1 and was one of the bloodiest.
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Germany sends the secret Zimmerman Telegram to Mexico in an effort to entice Mexico to join the war. The British intercept and decipher the coded message.
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The United States declares war on Germany.
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U.S. President Woodrow Wilson issues his Fourteen Points to peace.
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The Treaty of Versailles officially ends World War 1.
