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Archduke Francis Ferdinand is assassinated by Gavrilo Princip in Sarajevo
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Serbia must, end all anti-Austrian activities, let Austria officials handle the murder investigation, and they have 48 hours to meet these terms.
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Because of the assassination of Ferdinand that was committed by the Serbs, Austria declares war on Serbia
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The first battle of World war 1 begins. This battle was fought on the Eastern Front.
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This battle was fought on the Western Front.
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Lusitania is torpedoed without warning by a German submarine off the south coast of Ireland.
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This battle was the biggest naval engagement of World War 1.
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The Zimmermann Note was sent in January, 1917 from the German Foreign Office in that proposed a military alliance between Germany and Mexico.
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Fought between July 1 and November 1, 1918 near the Somme River in France, it was also one of the bloodiest military battles in history.
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World War 1 was offically over.