On Ascertaining the Time of the Establishment of Mao Zedong's Leadership

When did Mao Zedong hold the leadership? There are several versions on this question, such as holding at Zunyi meeting, Gouba meeting, the later period of the Land War, the Sixth Plenaiy Session of the Sixth Central Committee, the political Bureau Meeting of Central Committee of the CPC in 1943. In fact, the establishment of Mao?s leadership was not at that time as these views, but at the seventh National Congress of the CPC.