The Han dynasty of China replaced the Qin dynasty. Under the Han emperors, Confucianism became the philosophical basis of China's government. Confucianism stressed the importance of moral standards and tradition and of a well-ordered society in which people performed the duties of their stations in life.<NP> During the Han period, candidates for government jobs had to take a civil service examination based on Confucian ideals. In addition, art, education, and science thrived. Buddhism was introduced into China from India.<NP> Han China expanded southwest to what is now Tibet. Han warriors also conquered parts of Indochina and Korea and overcame nomadic tribes in the north and west. Political struggles among the Han leaders led to the collapse of the dynasty in A.D. 220.
