The fall of the Sui in the early 17th century led to a new power, one that revolutionized the social and empirical structure. At its height, the Tang Empire stretched from what is now Manchuria in the northeast into what is now Vietnam in the southwest. Building on the reunification of northern China and the southern China by the Sui dynasty. The Tang Empire established a strong, centralized state system, which brought together the aristocratic clans of all regions, finally ended four centuries of division between northern and southern China. The Tang dynasty was a time of great prosperity, many religions such Buddhism, and Daoism (Taoism), and the literature, scholarship, and arts of the Confucian flourished. The Tangs capital took place in Changan, which became one of the richest and most populous cities in the world, with two million people living there. The Tang dynasty was the time of great inventions, great poets, technologies, which not only influenced China itself in the future, but Asia as a whole.
Although Li Yuan founded this incredibly long-lived powerful dynasty, ruled as Emperor as Gaozu, but the real powers were in the hands of his son, Li Shih-min. Who later came to power, and assumed the title Tai-tsung. He was an energetic emperor and was determined to solve the internal problems that had destroyed past dynasties. He recreated the Chinese government. At the top of the hierarchy was the emperor; below his were three administrations; Council of the state, Military Affairs, and the Censorate. The most import of these three administrations was the council of the state, which drafted policy, reviewed policy, and implemented policy. The military affairs directed the military under the control of the emperor. The censorate watched over the government and government officials to prevent misgoverning, and corruption. This System that Tai-tsung had brilliantly came up with, led to the result of the central state system working more efficient than ever. The political greatness of the Tang Empire was due in majority to the group of Confucian scholars that advises the Emperor. These scholars were chosen through an indiscriminate civil service examination. The test meant as a competition to bring the among all the most talented people into the government. Past dynasties was due to their reliance on aristocratic families, nobles, and warlords. China flourished in part due to the new economic and trading ties with different regions.
Trade was possible because the Tang maintained a good foreign relation. The emperor and his court kept close attention to the power and possible threat of nomadic non-Chinese tribes along the northern border. During the 640s and the 650s, the Tang Empire established its dominance over the Turkish tribes in the north and west and the central Asia. In the 670s China once again gained control over the Tibetan peoples in Turfan. The Tang Empire traded with, India, Middle East, and Byzantium in the west. This was possible because the Tang maintained relative peace among the different races that traded along the Silk Road. Foreign merchants were welcomed in Changan. Foreign religions such and Manichaeism, Nestorian Christianity, and Zoroastrianism, were allowed by the Tang to built churches in Changan. Foreign merchants from Southeast Asia, India, Arabia, came by sea to the port of Canton. Then travel north to a large trading city at the southern end of the Grand Canal, and then proceeded along the canal to Changan.
The trading ties with India brought Buddhism to china and gave it a place in Chinese culture. One of the most important institutions in the Tang society were the Buddhist temples, which succeeded in their independence from government attempts to control them. The Buddhist Monasteries played many important roles in the Chinese society. Many held amounts of tax-free lands, which led it to be the most important economic institution in a local community. When there were problems, the Monasteries were the place to go for help. Farmers in need of money, or grain for planting borrowed from the monasteries; travelers lodged at the monasteries, local children went to the monasteries to learnt to read.
Chinese pilgrims, and foreign monks brought doctrines and texts form India and central Asia to China to be translated. Monks from Japan, Korea,