Instead there are a number of empires competing for authority B. Finally, in 581, China is reunited under the Sui dynasty. Like the Qin, the Sui use military to secure their authority. Like the Qin, they rebuild the Great Wall.
Re-establishes a government built on Confucian principles.
Among the important achievements, the expansion of the empire into Central Asia. The expansion is stopped by a Muslim army in 751 at the battle of Talas. China is open for a time to a range of foreign cultural influences, among which Buddhism is the most significant. Economy A. Chang'an, the capital, is the terminus of the Silk Road. In addition, a road linking Chang'an with Guanzhou on the coast is built.