How did the emperor Yangdi change China?

Emperor Yangdi, the second ruler of the Sui Dynasty, significantly transformed China through extensive infrastructure projects, most notably the construction of the Grand Canal, which facilitated trade and communication between northern and southern China. He also implemented a series of reforms, including the expansion of the civil service examination system, which aimed to create a more meritocratic government. However, his ambitious endeavors strained resources and led to widespread discontent, ultimately contributing to the downfall of the Sui Dynasty. Despite this, his reign marked a crucial period of unification and cultural development in China.