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Archduke Franz Ferdinand was murdered on 28th June 1914
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Russia mobilizes its vast army to intervene against Austria-Hungary in favor of its ally, Serbia. This move starts a chain reaction that leads to the mobilization of the rest of the European Great Powers, and inevitably to the outbreak of hostilities on July 30th 1914
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world war 1 began on August 4 1914
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Germany invades Belgium, beginning World War I
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1 July 1916 – 18 November 1916
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President Wilson outlines his case for war to Congress