Answer: The Russian Revolution
Notes: The Russian Revolution is the collective term for a series of revolutions in Russia in 1917, which dismantled the Tsarist autocracy and led to the creation of the communist government. The Emperor was forced to abdicate and replaced by a provisional government during the first revolution of February 1917. In the second revolution, during October, the Provisional Government was replaced with a Bolshevik (Communist) government.
