Final answer:
Russia withdrew from World War I in 1917 after the Bolshevik party took power, changing the course of the war by enabling Germany to concentrate its forces on the Western Front.
Explanation:
Russia withdrew from World War I in November 1917 after the Bolshevik party, led by Vladimir Lenin, seized power and promised to end the nation's involvement in the war. This withdrawal led to the negotiation of the Treaty of Brest-Litovsk in March 1918, where Russia conceded territory to Germany, allowing Germany to focus its strength on the Western Front.
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