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Let me talk about is not it, to say why, after the Revolution is not actually able to maintain China's territory, so your question is not established.
Mongolia has in fact independent Xinhai later, after World War II to the Nanjing national government recognize their independence.
Xinjiang, Qinghai, in a semi-independent state, whether it is the central government can not effectively control the Northern Nanjing, until the arrival of the Northwest Field Army.
Tibet in a semi-independent state penetration of the UK, and the brightest Buddha who ran the Indian mainland diligent than run, the Panchen request the central government to intervene, fruitless. Next Panchen finally to force the central government of the People's Republic.
Northeast is in competition for Russian-Japanese forces in Japan after decades prevailed, the Soviet Red Army and then a body, to recover the northeast to the interests of the fifties, after the Volunteers won in Korea.
Southwest Provinces infiltrated the British and French, the British and French until after World War II recession, unable to interfere.
Behind the mainland each warlord has powers shadow, in order to master fight to call.
Taiwan now or separatism.
Republic of China in fact has been unable to maintain China's territory, many legacy until now, such as Europe and denying China's sovereignty over Tibet, Xinjiang and Inner Mongolia, the Republic of China because of short-term loss of effective control over these areas, these areas are in the era of Republican actual division. Historical simulation game "Hearts of Iron" series, the reason why China was set up in a pile of small countries, is a reflection of this understanding. And this is the time of the actual state, a little long duration of the Republic of China, these areas will be the same as the Total Independence of Mongolia, China split.
The reason why China did not subsequently split, because the PLA can play too, not only to level these separatism, also foreign forces trying to encroach on the beat over and over, so there is lost effective control over the Republican Many areas can not be recovered, the point is that negotiations can only take back.