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Archduke Franz Ferdinand heir to the throne of the Austro-Hungarian Empire, and his wife are assassinated in Sarajevo.
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Emperor Franz Joseph of Austria-Hungary declares war on Serbia.
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Germany declares war on Russia
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Germany declares war on France as part of the Schlieffen Plan
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Germany invades Belgium, Britain declares war on Germany
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Ottoman Empire enters the great war
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Italy declares war on Austria-Hungary
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Bulgaria declares war on Serbia and fights with the central powers
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Germany declares war on Portugal
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Romania declares war on the central powers
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Greece declares war on the central powers
