What if the zhili clique unifies china?

The PoD is that one of the officers that took part of the Beijing coup during the second zhili-fengtien clique war decides to betray the putschists and reveal the details to Cao Kun, and so he aborts the coup and this cements his position as the chinese leader. In the following months Fengtien is crushed decisively by Wu Peifu, and thus the zhili unifies China in the late 1920s. What happens next?
 
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