Emperor Yang Di opened the door to the science and technology system. They used the imperial examination system to select talents, which weakened the power of nobles to a certain extent, put the power of selecting talents in the hands of the emperor, strengthened centralization, and gave ordinary people a way to become officials in the DPRK. He also unified literature and calligraphy at that time, paving the way for the ideological unity of the Tang Dynasty. Yang Di personally led three expeditions. Expanding the national territory and personal expedition failed, but it also made some small countries submit to him, and established a celestial system to pay tribute to China every year.
Emperor Yang Di Yang Guang built the Beijing-Hangzhou Grand Canal. It is the longest Grand Canal in China and is still in use today. It promoted the economy along the Grand Canal. It provides a way for economic and cultural exchanges between the north and the south of China, and provides us with many valuable wealth and precious sites today.
The cost of building the Grand Canal alone is too high. Because the Grand Canal is, after all, a big project, and Yang Guang asked millions of migrant workers across the country to start construction in a short time before it could be built, many people died of overwork, and building the Grand Canal required a lot of money, so Yang Guang increased taxes among the people, which brought a lot of burdens to the people and triggered fierce social contradictions.
Emotionally, he ruthlessly plundered and killed his loved ones. When Yang Guang was a prince, he did what he liked to win the favor of the emperor. When power came into his own hands, he turned and killed his father.