Why did Russia have to leave WW1 in 1917?
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The primary reason Russia exited World War I was the successful takeover of the Russian government in 1917 by the Bolsheviks in the Russian Revolution, which is also known as the October Revolution. The Bolsheviks did not support the war effort against Germany and its allies and like most of the population wanted an end to the rising death toll, economic deprivation and food shortages that the war had brought upon the country. Vladimir Lenin, the Bolshevik leader who took control of the new government after the revolution, viewed the war as a power struggle between imperialist nations and sought to divert Russia's efforts and resources towards building the new socialist state he had just helped to create.

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it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.