Final answer:
Emperor Wen of the Sui Dynasty unified China by creating a centralized government and moving regional administrators to prevent power accumulation. His successor completed the Grand Canal, enhancing economic unification. The reforms during and after Emperor Wen's reign greatly influenced Chinese bureaucracy, economy, and infrastructure.
Step-by-step explanation:
How Emperor Wen of the Sui Dynasty Changed China :
Emperor Wen, also known as Yang Jian, was instrumental in changing the course of Chinese history through several significant reforms. After becoming the first emperor of the Sui Dynasty in 581, he unified most of the territories that were once under the Han Dynasty. Wen established a strong, centralized government and sought to prevent regional administrators from amassing too much power, relocating them regularly to prevent the establishment of autonomous regional armies.
Despite the writings of famous Han Confucians, their influence was limited at that time. Emperor Wen, for example, brought Jia Yi to court but largely ignored his policy suggestions in favor of Daoist ideologies. Under Wen's successor, Yang Guang, also known as Emperor Yang Di, the Grand Canal was completed, significantly enhancing economic integration by facilitating the movement of goods between the north and south of China. This period also saw the imposition of forced labor and the establishment of an early police force to oversee these projects.