Final answer:
Confucianism replaced Legalism as the main ruling doctrine during the Han Dynasty.
Explanation:
During the Han Dynasty, Confucianism replaced Legalism as the main ruling doctrine. Under Emperor Wu, Confucianism gained exclusive patronage, and in 136 BCE, he abolished academic chairs not associated with the Confucian Five Classics. This marked a significant shift in ideological influence within the Han Dynasty.
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