Dasong's real estate policy prohibited foreigners from buying houses. What other policies are there?

Apart from preventing foreigners from buying houses in China and buying some maps of China and books related to history, they are also afraid that they will learn some knowledge about China. Moreover, China also provides "tour guides" for foreigners, in fact, in order to monitor foreigners and prevent them from doing things that are unfavorable to China. Although this sounds reasonable, it also isolated China from the world step by step during the Song Dynasty.

China has a long history and profound culture. Many countries want to come to China to see how China has developed. Especially in the Song Dynasty, the economy of the Song Dynasty developed very well, ranking among the best in the world, and many foreigners were willing to come to China to find out. But the monarch of a country in China is different. They think that China can be completely self-sufficient and does not need to communicate with other countries too much.

On the contrary, they thought that these messengers who came to China to study would learn some technologies from China, and the king was afraid that they would go to their own country to develop after learning China's technology, and finally surpass China. Moreover, in the Song Dynasty, China's four great inventions appeared gradually, which was a good opportunity for China to grow and develop. We must not let foreigners learn from it and finally attack China with China's own technology. So when receiving those foreigners, officials in China are very cautious.

Some China people wanted to go abroad to learn more knowledge to strengthen China, which was allowed at that time and supported this decision. On the contrary, foreigners who want to learn more in China are not very popular. Not only that, it is even more impossible to settle in China. In the Song Dynasty, it was stipulated that foreigners could not buy houses in China, nor could they buy maps and history books of China, for fear that foreigners knew too much about China and posed a threat to China.