Reasons for emigrating overseas: In order to move to the sea.

In the fourth year of Hongwu (137 1), Zhu Yuanzhang officially issued a decree prohibiting the sea: "People who are near the sea are forbidden to go out to sea without permission." Since then, imperial edicts have been issued every two or three years, prohibiting coastal people from contacting overseas countries, prohibiting people from communicating with foreign countries, prohibiting overseas exchanges, and dissolving foreign trade companies in Fujian, Zhejiang and Guangdong. He is also resolute. Every time he sends a letter, he immediately sends important officials around him to patrol the coast to investigate and deal with those who are "banned". From this point of view, it is still difficult to avoid some places where "there are policies at the top and countermeasures at the bottom", and he simply includes fishing at sea. Tang He, Duke of Guo Xin, once ordered him to "patrol the coastal cities of Zhejiang and Fujian, and prohibit people from fishing in the sea". So it was forbidden to come and go, and finally it was forbidden to build ships. First, it was forbidden to build a three-masted ship that could stay away from the shore, and then the ship became smaller and smaller. Finally, "the chess pieces were not allowed to enter the sea." With the authority of the founding king, he wrote it into Zuxun, promoted it to an established national policy, and incorporated it into Daming Law, making it institutionalized and legalized. Severely warned future generations: "Anyone who violates the ancestral system will be punished as a traitor." As a result, the maritime order runs through the history of the Ming Dynasty for more than 200 years. From Zhu Yunwen, who succeeded to the throne, to Zhu Youjian, who hanged Jingshan Park, and 15 emperors, every emperor just loosened his grip, but no one dared to say "no". It's always like Emperor Yongle sending Zheng He to the Western Seas, but at the same time, people are forbidden to go to sea privately. Lu recorded such a thing: a villager brought some felt shirts to Beijing and was identified as an illegal "counterfeit" by Jin Yiwei. He was immediately labeled as "connected with foreign countries" and went to death row. Judy thought it was too much and defended it herself, which saved the villagers' lives. However, although Yongle appeased the king's cheek, it did not abolish the sea ban. When Yongle died, people died. Western navigation is also banned. On the one hand, dependence is the ideological pressure of the ancestral system, on the other hand, it is also unsustainable in finance. Seven voyages to the West cost six million and two thousand silver. In the tribute trade carried out by Zheng He, according to the tradition of past dynasties, he insisted that other countries "come thin" and China "go thick". This is unbearable for an agricultural country. After the death of Emperor Chu, ministers immediately listed him as a "bad policy" and launched a fierce attack. Zhu Gaochi, who succeeded to the throne, was conservative in nature, and categorically declared that "ocean voyage will be stopped forever", including the construction of ocean-going ships and comprador voyage.

During the Jiajing period of the Ming Dynasty, the coastal residents of Zhejiang, Fujian and Guangdong moved 20 miles from south Zhili to north to prevent the Japanese pirates.

At the end of the Ming Dynasty, the Ming Dynasty waged several small-scale wars with Holland and Portugal. There are as few as three and as many as five. The Ming dynasty almost sucked milk with its strength and besieged the other side and ran away. Since then, the Ming dynasty has become more jittery and nervous. Going to the coast is to guard against death.

/kloc-in 0/8, the order to move the sea promulgated by Shunzhi in Qing Dynasty actually learned the old method of Ming Dynasty.