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War: Xin Qiji, nicknamed the "Southern Returner", was the representative of the Song Dynasty who moved to the south after half of the country was invaded.

Immigration to guard the border: During the reign of Emperor Khan Wu, he ordered 100,000 immigrants from the interior to today's Inner Mongolia to expand territory and resist the Huns.

Relocation of the Ministry: In ancient times, some dynasties moved their capitals: Pan Geng of the Shang Dynasty moved the capital to Yin, King Ping of the Eastern Zhou Dynasty moved the capital to Luoyi, Duke Jinggong of the Jin Dynasty moved the capital to Xintian, Emperor Xiaowen of the Northern Wei Dynasty moved the capital to Luoyang, and Hou Liang moved the capital to Luoyang.

Military needs: Today’s Tianjin culture is related to the large number of soldiers who were brought to Tianjin from Jiangsu and Zhejiang during the Ming Dynasty’s “King Yan’s Sweep to the North”.

National policies, economic development: such as the development of Xinjiang, gold rush in Shenzhen, etc.

Shifts in economic and political focus, natural disasters, expansion of territories, exile, etc.