The document summarizes the communist revolutions in Russia and China. It describes how in both countries, long-lasting dynastic monarchies faced economic and social problems that led to revolutions. In Russia, the revolution began in 1917 when the Tsar was overthrown and a provisional government took over, but it failed to solve Russia's problems. This led to a Bolshevik revolution and the rise of Lenin and communist rule, followed by a civil war that the communists won, establishing the Soviet Union until 1991. A similar pattern occurred in China, where the Qing dynasty fell in 1912 but the country continued facing issues until the communist revolution of 1949 established communist rule under Mao.