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A Serbian Nationalist killed Archduke Francis Ferdinand.
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Austro-Hungary declare war to Serbia because Serbia killed the throne of Austro-Hungary
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On 1915 Italy changed to neutral, but then it changed to the allies.
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Because of the consequences of war, Czar Nicholas II was forced. to give up power by the country.
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German and Austro-Hungary couldn't against the allies, so they lost.
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The countries of the Allies met at Versailles, Paris, to discuss peace terms.