Why did Liu Bei take the land of Sichuan and Shu and Zhuge Liang feel that he had changed?

At this time, Liu Bei is no longer just pregnant with the simple heart of the Han Dynasty, but has the desire to dominate. Therefore, after entering Shu, there will be measures to reflect the emperor's skills. Although he is orthodox and represents righteousness compared with Cao Wei and Sun Wu, he is essentially no different from other separatist princes. He is in troubled times. Only in this way can he really win the world. That's why Zhuge Liang said that Liu Bei was not the one he used to be. Zhuge Liang obviously felt helpless when he said this, because Liu Bei's inner values gradually changed from kingly to overbearing, and he was no longer the original Liu Xuande.