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The collapse of Tsarist Russia and the Bolshevik rise to power in 1917.
Tsar Nicholas II ruled Russia as an autocrat with near-total power. Widespread poverty, an unpopular involvement in the First World War, and food shortages built resentment among ordinary Russians.
In February 1917, strikes and protests in Petrograd, combined with the army refusing to suppress them, forced Nicholas II to abdicate, ending centuries of Tsarist rule and creating a Provisional Government.
The Provisional Government remained unpopular, partly for continuing the war. In October 1917, Vladimir Lenin's Bolsheviks seized power in a relatively swift takeover, promising "Peace, Bread and Land."
The Bolsheviks pulled Russia out of the First World War and fought a civil war (1918-1921) against opposing "White" forces, eventually securing control and establishing Communist rule.