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Franz the Archduke of Austria was killed by a Serbian citizen. One cause of the World War, causing Austria-Hungary to fight others.
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One month after Archduke Franz and his wife, Sophia were killed by a Serbian nationalist, Austria-Hungary declared war on Serbia. Russia, which is also Slavic, mobilized troops to the American boarder.
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Germany was honoring their relationship with Austria-Hungary. Germany knew that Russia would end up wanting to fight Austria-Hungary, so Germany decided to then declare war on Russia.
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Germany declared war on France as a part of the Schlieffen Plan.The Schlieffen Plan demanded the German troops to organize on the Belgium land, and had the idea to invade France.
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Belgium and Britain were nearly close by. The German control seemed to be a problem for Britain, something that Britain wouldn't ignore. Then, Britain decided to declare war on Germany.
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German troops crossed the border after Belgium refused Germany from passing through their country.
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Serbia killed Archduke Ferdinand, who was from Austria. Russia and Serbia were allies. Austria wanted Russia to be disciplined.
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France declared war by severing their diplomatic relations with Austria-Hungary
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Austria-Hungary was allies with Germany. Britain declared war on Germany after they invaded Belgium.
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Japan gives and ultimatum to Germany, demanding all German ships to be removed from their waters.
