The history of China people's struggle to realize the two historical tasks of "national independence and people's liberation" and "national prosperity and people's common prosperity", that is, the history of realizing the great national rejuvenation on the basis of liberating and developing productive forces, is the theme of China's modern history.

There are four main historical lines in China since modern times:

1. The historical process of China people's opposition to foreign aggression, striving for national independence and national liberation, expanding international participation, and stepping into the world's national forest since modern times.

Second, the historical process of China people's struggle for wealth, liberation and development of productive forces and modernization since modern times.

Third, the historical process of China people's struggle for and realization of people's democracy since modern times.

Fourthly, the historical process of China people seeking truth from the West and choosing Marxism since modern times, as well as the China and modernization of Marxism.

Extended data:

The modern history of China is the history of China from the outbreak of the Opium War in June 1840 to the founding of People's Republic of China (PRC) in June 1949. The semi-colonial and semi-feudal society in China gradually formed and disintegrated after the late Qing Dynasty, the provisional government of the Republic of China, the northern warlords and the national government.

The modern history of China is a history of humiliation full of disasters, backwardness and beatings, a history of China people's exploration of saving the country and realizing freedom and democracy, and a history of China people's struggle against aggression, overthrowing imperialism and realizing national liberation and feudalism and people's prosperity.