The document summarizes key events and policies related to modern China, including its early contacts with Western powers in the 19th century, the struggle for power between Nationalists and Communists in the early 20th century, and major economic and social policies and reforms under Mao Zedong and Deng Xiaoping from the 1950s-1980s. It discusses the emergence of China as a communist nation after the Communists took control in 1949, and covers Mao's Great Leap Forward and Cultural Revolution as well as Deng's Four Modernizations program and economic reforms.