Political map of East Asia and the Western Pacific 26 June 1930 (Central Plains War): Despite the claims to unity (Chinese reunification (1928)), Chiang Kaishek (Chiang Kai-shek)'s hold over China was tenuous. In 1930, Yan Xishan (Yan Xishan), the Guominjun (Guominjun) and the Guangxi clique (New Guangxi clique) turned against him in the Central Plains War (Central Plains War).