The document summarizes the key events of the Russian Revolution, beginning with the socioeconomic causes in the late 19th century and continuing through the establishment of the USSR. It describes the 1905 revolution, World War I, the February and October revolutions of 1917 that overthrew the tsar and brought the Bolsheviks to power led by Lenin. Lenin then established communist rule and took Russia out of WWI, sparking a civil war that the Bolsheviks eventually won.