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In page Sichuan:

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In the 20th century, as Beijing, Shanghai, Nanjing, and Wuhan had all been occupied by the Japanese during the Second Sino-Japanese War, the capital of the Republic of China had been temporarily relocated to Chongqing, then a major city in Sichuan. An enduring legacy of this move is those nearby inland provinces, such as Shaanxi, Gansu, and Guizhou, which previously never had modern Western-style universities, began to be developed in this regard.[1] The difficulty of accessing the region overland from the eastern part of China and the foggy climate hindering the accuracy of the Japanese bombing of the Sichuan Basin made the region the stronghold of Chiang Kai-shek's Kuomintang government during 1938–45 and led to the Bombing of Chongqing.[citation needed]