The Warring States period was an important period in Chinese history, following the Spring and Autumn period, and is generally considered to have started in 475 BC and ended with Qin Shi Huang unifying the Six Kingdoms in 221 BC. This period was characterized by frequent wars between vassal states and rapid technological, cultural, philosophical and other developments. One of the landmark events of the Warring States period was the "Three Families Divided into Jin", that is, the three families of Han, Zhao, and Wei divided the Jin Kingdom, forming three important states among the Seven Heroes of the Warring States.
During the Warring States period, there were seven major vassal states, namely Qin, Wei, Han, Zhao, Chu, Yan, and Qi, and these states engaged in a series of annexation wars during this period, which eventually led to the unification of the country by Qin. This period was also an era of contention of thought, with the emergence of many schools of thought, such as Confucianism, Legalism, Taoism, and Moism, which had a profound impact on ancient Chinese culture and philosophy.
