The large-scale historical music and dance epic "The East is Red" is about which part of China's history ah?

After the founding of the Chinese Communist Party, the Chinese people, under the leadership of the Chinese Communist Party and Chairman Mao, engaged in an arduous revolutionary struggle against imperialism, feudalism and bureaucracy.

Events: 1. Autumn Harvest Uprising

2. Zunyi Conference

3. Forced crossing of the Dadu River

4. Crossing of the Snowy Mountains and Grasslands (2. 3. 4. are the Red Army's Long March)

5. Rendezvous of the Three Main Forces of the Red Army

6. Lugouqiao Incident

7. War of Resistance Against Japanese Aggression

8. War of Liberation

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9. Liberation of Nanjing

10. Establishment of the People's Republic of China