Why were Mao Zedong and the Chinese Communist Party Able to Gain Control of China in the Years 1937-49?

Mao Zedong and the Chinese Communist Party(CCP) were able to gain control because of many reasons. Almost all the Chinese people living under Chiang Kaishek's rule weren't happy because of high taxes, accusations and chaotic life. Many people under GuoMingDan(GMD) rule left to live under CCP rule where there were lower taxes. Peasants especially were attracted to CCP rule because the land was distributed fairly and people gave them self-respect. The red army protected communists, peasants liked the interest free loans and rents were reduced.
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