The Second Sino-Japanese War, which lasted from 1937 to 1945 (merging with World War II in 1941), grew out of Japanese encroachments on Chinese land.
In 1958, Mao undertook the Great Leap Forward campaign, a crash program of industrialization, but none of its goals were reached, and the effort collapsed.
In the mid-1960s, Maos wife, acting on his behalf, and three colleagues, later known as the Gang of Four, advanced the goals of the Great Proletarian Cultural Revolution, aimed at eliminating old ideas and customs. Mobs attacked schools and cultural centers, brutally disrupting the entire nation. With the death of Mao in 1976 and the trial of the Gang of Four in 1980, the Cultural Revolution came to an end.
Although China remains officially communist, its government encourages capitalism in designated areas, especially in its southeastern provinces. China has experienced considerable economic development in recent decades. Relations with the United States remain tense, especially over Taiwan, but the United States supported Chinas admission to the World Trade Organization (WTO).