Warring States Period (403 BC – 221 BC)
The Warring States Period takes place from sometime in the 5th century BC to the unification of China by Qin in 221 BC. The date for the beginning of the Warring States Period is somewhat in dispute. While it is frequently cited as 475 BC, following the Spring and Autumn Period, 403 BC, the date of the tripartition of the State of Jin, is also sometimes considered as the beginning of the period. It is nominally considered to be the second part of the Eastern Zhou Dynasty, following the Spring and Autumn Period. Like the Spring and Autumn Period, the king of Zhou acted merely as a figurehead.
The Warring States Period, in contrast to the Spring and Autumn Period, was a period when regional warlords annexed smaller states around them and consolidated their rule. The process began in the Spring and Autumn Period, and by the 3rd century BC, seven major states had risen to prominence. These Seven Warring States, were the Qi, the Chu, the Yan, the Han, the Zhao, the Wei and the Qin.
The proliferation of iron working in China was seen by the Warring States Period, replacing bronze as the dominant metal used in warfare. Areas such as Shu and Yue were also brought into the Chinese cultural sphere during this time. Walls built by the states to keep out northern nomadic tribes and each other were the precursors of the Great Wall of China. Different philosophies developed into the Hundred Schools of Thought, including Confucianism (elaborated by Mencius), Taoism (elaborated by Zhuang Zi), Legalism (formulated by Han Feizi) and Mohism (formulated by Mozi). Military tactics also changed. Unlike the Spring and Autumn Period, most armies in the Warring States Period made combined use of infantry and cavalry, and the use of chariots gradually fell into disfavor.This was also around the time legendary military strategist Sun Wu wrote The Art of War which is recognized today as the most influential, and oldest known military strategy guide.
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