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Why did negotiations between Mao Zedong and Chiang Kai-shek fail after World War II?

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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.

Negotiations between Mao Zedong and Chiang Kai-shek failed primarily because both sides remained deeply divided over the fundamental structure of the postwar government, the control of liberated territories, and the integration of their respective military forces. While an agreement in principle was reached in October 1945, neither party was willing to sacrifice its military gains or political autonomy to achieve a lasting peace.12

The breakdown of these efforts was driven by several key factors:

Internal Opposition: Within the Kuomintang (KMT), conservatives feared that political reforms would dilute their control, while Nationalist generals strongly resisted proposals to reduce the size of their armies.1
Military Competition: Despite various cease-fire agreements, both sides continued to scramble for territory, particularly in Manchuria following the withdrawal of Soviet troops. This led to renewed fighting that repeatedly undermined diplomatic progress.231
Lack of Trust: The Marshall Mission attempted to broker a coalition government and military integration, but these efforts were ultimately fruitless as the parties could not reconcile their competing visions for a unified China.23

By late 1946, the failure to implement these agreements led to the adoption of a new constitution by the Nationalists without Communist participation, effectively signaling the end of reconciliation efforts and the escalation of full-scale civil war.2