The Xia Dynasty was founded in 2070 BC. The center of its activities was the western section of modern Henan Province and the southern section of modern Shanxi Province, and its sphere of influence reached the northern and southern areas of the Yellow River. With the Xia Dynasty, China entered slave society. The following Shang (1600-1046 BC) and Western Zhou (1046-771BC) dynasties saw further development of slave society. This era was followed by the Spring and Autumn (770-476 BC) and Warring States (475-221 BC) periods, characterized by the decline in power of the ruling house and struggles for power among regional powers, marking the transition from slave society to feudal society.
Chinese had mastered the technology of smelting bronze approximately 5,000 years ago and iron tools came into use during the Shang Dynasty, 3,000 years ago. White pottery and glazed pottery were produced. Silk production was considerably developed and the world's first figured inlaid silk weaving technique appeared. During the Spring and Autumn Period steel production technologies made their debut. During the Spring and Autumn and the Warring States periods, there was a great upsurge of intellectual activity, producing many famous philosophers, such as Lao Zi, Confucius, Mencius and Mo Zi, and the well-known military scientist Sun Wu.
