How was the development of confucianism related to fighting among rival kings?

Confucianism brought peace and stability to China.

Explanation:

He spent a good part of his life traveling around the country, passing on the teaching to people that each individual is essential and has a purpose in this world. His education encouraged rulers to be moral examples to their followers. After his death, his students continued this teaching. Through various schools of philosophy, the Chinese sought to help their society, all walks of life. Confucianism is the most influential school.

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~courtney