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The archduke Francesco Ferdinando (heir to the throne of Austria) is visiting Sarajevo (Bosnia) when he is murdered with his wife by a Serb-Bosnian student, Gavrilo Princip.
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The real cause of the war is the clash between Germany and Britain for power in Europe.
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Russia enters the war against Austria for help Serbia.
Germany goes to war against Britain, France and Russia during Italy remains neutral.
There are two alliances at war: Triple Accord (Russia, France, Great Britain and Japan) and Triple Entente (Germany, Austria, Bulgaria and the Ottoman Empire) -
Italy enters the war with the London pact.
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The US enters the wars with French, Britain and Italy.
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In 1918 italian, french, britain and american army won against german and austrian army.
4 novembre 1918: the States sign the armistice. -
In June 28, 1919 at Versailles the states sign the peace treaty and they divide the won lands.