Bad: During the construction of the Grand Canal, the working people worked day and night, and the supervisors were extremely harsh, flogging them and sometimes not giving them food, so many people died for this Grand Canal. After the Grand Canal was completed, Yang Di went to the south of the Yangtze River several times and turned a blind eye to state affairs. The dragon boat he took was unimaginable, with a hull of tens of meters and several floors for his entourage to live and play. Many such dragon boats were built and cut down. It is impossible for some poor counties to provide food and silver to so many people every day. Emperor Yang Di arrested the county magistrate and accused him, which brought great disaster to the people. Tens of millions of migrant workers pull boats at ordinary times, and countless people are exhausted every day.
That's all I know,