中原大戦
Between 1929 and 1930, Wang collaborated with Feng Yuxiang and Yan Xishan to form a central government in opposition to the one headed by Chiang. Wang took part in a conference hosted by Yan to draft a new constitution, and was to serve as the Prime Minister under Yan, who would be president. Wang's attempts to aid Yan's government ended when Chiang defeated the alliance in the Central Plains War.