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It is known that the main reason for the first world war 1914-1918 was the colonial race between France, Britain on the one hand and Germany on the other. The results of this race was the war of the Entente and the Triple Alliance, followed by the collapse of the four largest empires in the world and the change of the political map of Europe in the years to come.
On the territory of the former Russian Empire there were more than two dozen different States, at the expense of Austria-Hungary, Yugoslavia and other States were created. Germany, although it lost, but was ready to take revenge, which happened in 1939.
According to some reports, more than 10 million soldiers were killed during the First world war. The consequences of the war were deplorable, both for Germany and for the victorious countries. The economy in all of these countries was in decline, except perhaps the US. Germany lost 1/8 of its territory and some colonies.