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how would this have effected Nationalist China's foreign relations and the willingness of the western powers and Japan to recognize the Nanjing government?

Would a major British, Japanese or combined expedition to fight the KMT-CCP united front have become likely?

Would the Soong family (Shanghai legitimate business) and Shanghai Green Gang (Shanghai underworld) have been willing to work in close alliance with a Chiang who had not ditched the communists?

Would the advantages of the United Front and lack of a Wuhan-Nanjing split for speedy victory in the northern expedition have outweighed additional support that opposing warlords might have gotten from foreign powers and the Chinese wealthy classes in reaction to the continued perception of Chiang Kaishek as a "radical" red general?
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