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In page Federalism in China:

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Proposals for a federal Chinese state were first advanced in the 1920s, but these proved unpopular. These often used the phrase United Autonomous Provinces as the name of the intended system.[citation needed] Hunan was the center of this movement. The young Mao Zedong even advocated the formation of a "Republic of Hunan" during that period. But many intellectuals, including Sun Yat-sen, argued that these proposals would limit the ability of China to fight off external invasion and would legitimize the rule of warlords. By the 1920s, Sun categorically rejected federalism.[4]: 68  The young Mao Zedong wrote on the Ta Kung Pao proposing the idea of splitting the whole China into 27 countries.[5][6] He wrote︰