* The support of the peasantry: The Chinese Communist Party (CCP) was able to mobilize the support of the peasantry by promising land reform and other economic benefits. This was in contrast to the Kuomintang (KMT), which was often seen as representing the interests of the landed gentry and urban elites.
* The CCP's military strategy: The CCP adopted a guerrilla warfare strategy that was well-suited to the terrain and conditions of China. This strategy allowed the CCP to avoid decisive battles with the KMT's superior forces and wear them down over time.
* The corruption and incompetence of the KMT: The KMT was plagued by corruption and incompetence, which alienated many people in China. This made it difficult for the KMT to effectively combat the CCP.
* The Soviet Union's support: The Soviet Union provided the CCP with military and economic aid, which was essential to the CCP's victory.
In conclusion, the communist victory in the Chinese Civil War was due to a combination of factors, including the support of the peasantry, the CCP's military strategy, the corruption and incompetence of the KMT, and the Soviet Union's support.