Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The history of the Soviet Union has roots in the Russian Revolution of 1917. The Bolsheviks, led by Vladimir Lenin, emerged as the main political force in the capital of the former Russian Empire, though they had to fight a long and bloody civil war against the Whites. The Bolsheviks became known as the Russian Communist Party (Bolsheviks), and their Red Army eventually won the Civil War. From the territories of the former Russian Empire emerged the Russian Soviet Republic, along with the Ukrainian, Belarusian, and Transcaucasian republics which were eventually to unite to form the Union of Soviet Socialist Republics. During World War I, Tsarist Russia experienced famine and economic collapse. The demoralized Russian Army suffered severe military setbacks, and many soldiers deserted the front lines. Dissatisfaction with the monarchy and its policy of continuing the war grew. Tsar Nicholas II abdicated in February of 1917 following widespread rioting in Petrograd.