The document summarizes the growth of Soviet power from its origins in Kievan Rus in the 9th century through World War II. Major events included the Mongol invasion in the 13th century, Ivan the Great freeing Russia from Mongol influence in the 15th century, and Peter the Great expanding the Tsardom into a major European power in the 17th-18th centuries. The 1917 revolution established Bolshevik rule under Lenin and Trotsky, and the USSR was officially formed in 1923 under Stalin's leadership. Stalin instituted five-year plans, collectivization, and purges to rapidly industrialize the Soviet Union. By the end of World War II, the USSR had emerged as one of the two superpowers alongside the United States