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Franz Ferdinand, archduke of Austria-Hungry, assasinated in Sarajevo
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Unhappy at their response, Austria-Hungry declares war on Serbia
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Due to the alliance, Russia mobilises to support Serbia
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Due to the alliances, Germany declares war on Russia
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Germany invades France through Belgium
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Germany invades Belgium using the Schlieffen Plan. Britain declares war on Germany.
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Britain declares war on Germany
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Austria-Hungry declares war on Russia