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Why did Mao Zedong proclaim the People’s Republic of China on October 1, 1949?

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Chinese Civil War, Shanghai, c. 1949 — Chinese Civil War Nationalist Army soldiers preparing to defend Shanghai from Communist forces, c. 1949.

Mao Zedong proclaimed the establishment of the People’s Republic of China on October 1, 1949, because the Chinese Communist Party (CCP) had achieved a decisive victory in the Chinese Civil War.12

By the latter half of 1949, communist forces had successfully captured most of the Chinese mainland, effectively dismantling the Nationalist government's control. Following the failure of peace negotiations earlier that year, the People’s Liberation Army crossed the Yangtze River and occupied major cities, including Nanjing and Shanghai. As the Nationalist government retreated to Taiwan, the CCP held the vast majority of the mainland, providing the political and military foundation for Mao to formally declare the new state in Beijing.123

This proclamation marked the transition of power to a party that aimed to transform China into a socialist society and a great power through industrialization and the consolidation of a "people’s democratic dictatorship".4