The document summarizes the Russian Revolution and the establishment of the Soviet Union under Lenin and Stalin. It describes how World War I led to unrest in Russia and the overthrow of the Czarist monarchy in 1917. Lenin and the Bolsheviks then took power and withdrew from the war, establishing a communist government. Lenin introduced policies like the New Economic Policy to rebuild the country after the turmoil of revolution and civil war. After Lenin's death, Stalin came to power and instituted rapid industrialization and collectivization, though with policies that oppressed citizens and killed millions.