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Francis Ferdinand assassinated at Sarajevo.
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Kaiser William II promised German support for Austria against Serbia.
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This had took place in Britain.
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The British had taken to transporting military supplies from America to England in the holds of luxury liners. The Germans knew this and so made the warning that all ships entering the "exclusion zone" were legitimate targets.
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They had declared war on Germany and Austria
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Start of the Battle of Verdun
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British forces surrendered to Turkish forces at Kut in Mesopotamia
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USA declared war on Germany
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France launched an unsuccessful offensive on the Western Front
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Germany started an offensive in Flanders
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Turkish forces collapsed at Megiddo