Answer: Philosophy
Explanation: It was called "Hundred Schools Thought" period.
Elements of Chinese philosophy has existed for many years, but it was during the Warring Stated that Confucianism, Legalism, Taoism and other philosophies arose.
Confucianism is still a major influence in Chinese culture. That, along with the Legalism, is responsible for creating the world's first meritocracy, In other words, the status of someone must be determined by education and character.