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In page Wuhan:

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In 1926, the Northern Expedition reached the Wuhan area and it was decided to merge Hankou, Wuchang and Hanyang into one city in order to make a new capital for Nationalist China. On January 1, 1927,[1] the resulting city was proclaimed as '武漢' (the traditional Chinese characters for 'Wuhan'), which was later simplified as '武汉' (also 'Wuhan').[2][3][4]