On July 19, 1920, the Second Congress of the Communist International was held in Moscow from July 19 to August 7, 1920, the Second Congress of the Communist International was held in Moscow from July 19 to August 7, 1920, and was adopted by Lenin on the National and Colonial Question, which systematically discussed the theories of the national and colonial revolution and played an important role in the development of the Democratic Revolutionary Program of the Communist Party of China.