Did Guan Yu's death accelerate the demise of Shu?

yes. In Longzhong Dui, Zhuge Liang said: "If there are advantages and benefits across the bridge, we should protect its rock resistance, make progress in the west and in the south, make progress in the foreign countries, make good connections with Sun Quan on the outside, and repair politics internally;" If the world changes, a general will be ordered to take Jingzhou's army to Wan and Luo, and the general will lead the Yizhou people out of Qinchuan. Who dares not to eat the kettle pulp to meet the general? If this is the case, the hegemony can be achieved and the Han family can flourish. " Jingzhou is also a part of the great cause. After all, Yizhou alone is still too small. After Guan Yu lost Jingzhou, a series of fiasco followed: Zhang Fei was killed and Liu Bei defeated Yiling, which was even worse.