The city of Xiamen has a long history, with human activity recorded as early as 3,000 years ago and an administrative organizational structure dating from the Song Dynasty. At that time, the place was named Tong’an County. Millennia after that, the city of Xiamen had changed its name several times. It was called “Jia He Yu” in Song Dynasty, “Zhong Zuo Suo” at the beginning of Ming Dynasty, and then “Xiamen City”. At the end of Ming Dynasty, Zheng Chenggong called it “Siming Island”, or "Remembering the Ming", and in 1993 the city was renamed as “Xiamen”.The port of trade used by Portuguese in 1541, Xiamen was one of the main ports in the nineteenth century for exporting tea. It was then opened as one of the five Chinese treaty ports as a result of the First Opium War between Britain and China in 1840. In 1949, Xiamen became a provincial city and was then upgraded to a vice-province-class city of the People’s Republic of China. Since 1980, it was made a Special Economic Zone and the city of Xiamen has continued its accelerated progress.