What are the historical conditions for the unique development of Quanzhou's overseas trade

1087, Fujian Shipping Department was formally established in Quanzhou in the Northern Song Dynasty to manage overseas trade. After the Song Dynasty moved south, Fujian became the rear area of the Southern Song Dynasty. Quanzhou is located in the center of the southern song dynasty coastline, with Guangdong and Guangxi in the south and Jiangsu and Zhejiang in the north, so it was valued and supported by the southern song dynasty court. China's merchant ships have been traced as far as Korea and Japan, and as far as Arabian Peninsula and the east coast of Africa. The maritime Silk Road, which enjoys huge profits, has played a great role. It can be seen that the historical conditions for the unique development of Quanzhou's overseas trade include the establishment of special management institutions by the government, the relocation of the economic center to the south, foreign trade ports, convenient transportation and the smooth maritime Silk Road ~