The Russian Revolution had a profound impact on the Cold War by establishing a communist government that directly challenged capitalism and democracy. The revolution, which resulted in the Bolshevik takeover in 1917, led to the creation of the Soviet Union. This shifted global power dynamics, as the United States and its allies opposed the spread of communism. Tensions escalated, leading to the ideological, political, and military rivalry that characterized the Cold War era. The establishment of the Iron Curtain and the division of Europe into Eastern and Western blocs were direct consequences of the revolutionary changes initiated in Russia.