What are the reasons for the prosperity and rapid demise of the Sui Dynasty? What are the historical facts of recruiting farmers? What does Yang Di's three visits to Jiangdu reflect?

Mainly due to Yang Guang's excessive expropriation, coupled with the construction of personal desires, it wastes people and money. For example, the direct purpose of building the Beijing-Hangzhou Grand Canal is to make it easier for him to go to Yangzhou. In the Sui Dynasty, emperors and officials acted downward. Simply put, the emperor took the lead in corruption, as if the country was not his. This is the same as the Yuan Dynasty established by Mongols later. Obviously, he is the master of this country, but he also drives the people to the wall. Is this not a joke?