Iwata argues that innovations have been transmitted from the north across the Huai River to the Lower Yangtze Mandarin area and from there southeast to the Wu area and westwards along the Yangtze River valley and thence to southwestern areas, leaving the hills of the southeast largely untouched.
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This is mainly because many Xiang-speaking immigrants from Hunan moved to Sichuan during the great wave of immigration during the Ming and Qing Dynasties, so Xiang does not have such a close relationship with other southwestern varieties of Chinese, such as those spoken in Yunnan, Guangxi or Hubei.