Ancient Chinese civilization developed along the Yellow and Yangtze Rivers in China between 2070 BC-1912 AD. Key periods included the Xia, Shang and Zhou Dynasties which established early Chinese culture, followed by the Qin Dynasty which first unified China in 221 BC. The long-lasting Han Dynasty which ruled from 206 BC-220 AD saw advancements in agriculture, trade, and bureaucracy which established institutions that shaped China for the next 2,000 years. Imperial China was then governed by a succession of dynasties until 1912.