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Because compared with the north, the south has a wide variety of developable economies, which develop more rapidly, with outstanding talents and more talents. Besides, the influence of Emperor Yang Di belongs to the northern region. In order to consolidate his power and expand the territory of the Sui Dynasty, Emperor Yang of Yang Di went to Yangzhou three times to expand his understanding of the south and make his control more stable.

(1) In ancient times, the economic development in the south was generally faster than that in the north, because there was more trade that could be developed in the south, the mobility between cities was great, and the climate was mild, so it would not be colder than that in the north. Yang Guang, the Emperor of Yang Di in Sui Dynasty, was a famous and ambitious king in history. However, although he pursues national development excessively, his policies and measures are commendable.

The power of the Sui Dynasty was concentrated in the north, but three huge projects were successively established: building the eastern capital, digging canals and visiting Jiangdu, which were also unified. Their direction is towards the south. It is obvious that Emperor Yang Di wanted to establish contact with the south through these projects, thus promoting the economic development of the north.

(2) Although Emperor Yang Di had a solid foundation in the north, the south was always a huge hidden danger. Throughout the ages, due to various reasons, the North and the South have often been separated, which has caused irreparable harm to the development of both sides. Yang Di's pursuit of great achievements in this way must be to control his power in the southern region, so as to consolidate the country of the Sui Dynasty.

During Yang Di's reign, he made three southern tours to Jiangdu, but this seems to be a southern tour. In fact, Emperor Yang Di Yang Guang wanted to know more about the south. Emperor Yang Di grew up in the northwest for a long time and was too strange to the south. Therefore, in order to establish his prestige in the south, Yang Di visited Yangzhou and took a series of influential measures. In 605 AD, Emperor Yang Di pardoned Jiangnan, and in order to recuperate, he was exempted from Jiangnan taxes for one year. In 6 10, Yang Di promoted the status of Jiangdu; In 6 16 AD, the Sui Dynasty was already in turmoil, with civil strife in the north and Yang Di stabilizing the southern region.

In a word, this is the reason why Emperor Yang Di favored Jiangnan.