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Was the spark that ignited a giant blaze. This single terrorist act set off chain reaction within alliance system that would result in the largest war Europe-and the world-had ever seen.
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The battle lines were clearly drawn. There were two sides one side were the Central powers(Germany, Austria-Hungary) and the other side known as the allied powers( Great Britian,France and Russia)
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The Allies attacked Germans northeast of Paris, in the valley of the Marne River.