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I don't think our textbook said as much about Sun as about Liu and Cao. It was in newer version they taught us that Taiwan was contacted by Sun's territory. ( Sun was in the southeast coastal China. )
The old government identified with Liu Bei. And chairmanman Mao was a Cao Cao fan.
Cao was also a star writer in our textbook of Chinese literature. He was taught next to Kongming.
Kongming's essay was taught for his spirit of devotion to the country and boss. Cao was taught because he was a talented poet