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Assassination of Archduke Franz Ferdinand
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Kaiser Wilhelm II of Germany guarantee his country's support for Austria-Hungary in its conflict with Serbia
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Austria-Hungary issue a ultimatum to Serbia
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Austria-Hungary diplomats leave Serbia and begin full mobilisation
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Austria-Hungary declares war on Serbia
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Russia begins troop mobilisation
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Austrian warships bombard Belgrade
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Germany declares war on Russia. France and Belgium start mobilization
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Germany declares war on France and invades Belgium
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Great Britain declares war on Germany. The declaration apply to all Britain colonies