Li Shimin, the second emperor of the Tang Dynasty, Taizong, defeated the Eastern Turks and conquered the northern and southern deserts. Li Zhi, Emperor Gaozong of the Tang Dynasty, destroyed the Western Tujue and set up the Anxi and Beiting prefectures. The Tang Empire stretched from the coast of Korea in the east to the Water of Dachang (Amu Darya River) in the west. It was the world's most developed and powerful country at that time, with its economic and cultural development ranking among the top in the world. Through the Silk Road, the Great Food Empire served as a bridge between the East and the West, and both official and civilian exchanges were conducted in a comprehensive and friendly way.
In the eastern section of the Silk Road, north and south of the desert and countries in the Western regions, built many branch lines to connect the Silk Road, also known as "Shentianke Khan Road (Day Khan refers to Tang Taizong)". Great Food, the Eastern Roman Empire also sent envoys to Chang 'an to communicate with China. Dunhuang, Yangguan and Yumen became the "city on land" at that time. On the sea route, Chinese ships could also sail to Linyi (present-day southern Vietnam), Zhenla (Cambodia), Ha Ling (present-day Java), Husan (present-day Burma), and through Tianzhu (present-day India) to Dashao, making relations with European countries. At that time, Guangzhou, Quanzhou, Liujiagang (near Wusongkou of Shanghai today) and other places became the most famous foreign ports. Historical records show that there were barging docks such as Nanhai Ship, Kunlun Ship, Lion Ship, Brahmin Ship, Western Ships and Persian ships in Guangzhou. Western countries through the land through Central Asia, the Western Regions, along the camel caravans constantly; By sea, most of the big food capital Baghdad out of the Persian Gulf, almost daily ships across the ocean to the East.
