In June 1840, the Opium War broke out. In August 1842, the Qing government was forced to sign the Sino-British Treaty of Nanjing with Britain, the first unequal treaty in modern Chinese history that was humiliating and humiliating. After that, China lost its complete and independent sovereignty, the natural economy of Chinese society was destroyed, and it began to change from a feudal society to a semi-colonial and semi-feudal society. The Opium War became the beginning of China's modern history. On January 1, 1912, Sun Yat-sen was sworn in in Nanjing, announcing the establishment of the Provisional Government of the Republic of China. On May 4, 1919, the May Fourth Movement broke out, and on July 23, 1921, the First National Congress of the Communist Party of China opened in Shanghai.
Intent: Can be used to review history