From the Tang Dynasty to the Yuan Dynasty, why did Central Asian Semu people refuse to go back when they came to the Central Plains?

First, this is because when they came, although the environment was harsh, they had to go through a lot of help and tribal services to sleep on this road, and they had to pay some fees every time they passed by, so they didn't want to go back after they came, because they still had to repeat these environments when they went back.

2. Before Yuan Dynasty, many people came to China as businessmen. No matter which Silk Road goes east, it must pass through deserts, wasteland, snow-capped mountains and swamps. In addition to the harsh natural environment, from Rome in the west to Chang 'an in the east, trade routes thousands of miles away have to pass through various countries and tribes, and every place has to pay heavy taxes. More seriously, after the third century, the world was in chaos and the road leading to the Silk Road was paralyzed. Even in the Yuan Dynasty, Kelpolo met many robbers and gangs, so it is not surprising that the prices of silk and gold in Europe are different.

Third, the Silk Road is not very smooth, and the Maritime Silk Road is also full of risks. The three major routes of the western Pacific, the Indian Ocean and the Mediterranean are actually not connected. Before the Suez Canal was built, the caravan had to venture across the desert. Due to the confrontation between Christianity and Islam, the canal was constantly destroyed and rebuilt until the end of 19, when France occupied and achieved peace.

Three, due to backward navigation technology, has been drifting in Guangdong for eight months, many times into the hexagonal channel. The sinister experience can be imagined. After the Song Dynasty, the large-scale application of compass and watertight compartment invented by China people made the Maritime Silk Road prosperous gradually, but it took two years to get from Guangzhou to Persia.

Fourthly, most of the people who came to China in the Yuan Dynasty were Mongolian soldiers and craftsmen. At first, the position was low, but it was repeatedly used by the military power, and eventually became the agent of the Mongols in the Central Plains. During the Southern Song Dynasty, it benefited from the protection of the Yangtze River. Jiangnan region was free from war and immediately became the center of economic development in the Central Plains. Jiangnan's strategic position in the Yuan Dynasty should not be underestimated. The south sent a large number of colored officials, generals and troops.