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The Russian Revolution (1917-1921)
The Russian Revolution of 1917-1921 was a period of political and social upheaval in Russia that resulted in the overthrow of the Tsarist autocracy and the establishment of the Soviet Union. It began in February 1917 with the abdication of Tsar Nicholas II, and ended in October 1921
From Wikipedia
The Russian Revolution was a period of political and social change in Russia, starting in 1917. This period saw Russia abolish its monarchy and adopt a socialist form of government following two successive revolutions and a civil war. It can be seen as the precursor for other revolutions that occurred in the aftermath of World War I, such as the German Revolution of 1918–1919. The Russian Revolution was a key event of the 20th century.