When there was only one deck of cards left in the Southern Song Dynasty and the late Ming Dynasty, why didn't the court go to Nanyang to expand a base area?

Chinese civilization is essentially a continental civilization, which is different from the marine civilization that loves adventure and development. China people are small-scale farmers. The so-called "two acres of land, a cow, wife and children on the kang hot", the idea of self-sufficiency in the field is deeply rooted. As long as there is a little marine civilization, the national subjugation like Nanming will not happen, because the intensification of domestic contradictions itself is the result of climate disasters, land annexation and population saturation. If marine culture is extended to the discovery of the new continent, this fundamental survival problem can be fundamentally solved. Overpopulation and insufficient land distribution, go outside to find more land. People's wealth is uneven, so they have to go outside to rob others. 13 ~ 17 th century The terrible era of navigation was driven by poverty in Europe. After the great geographical discovery, Europe fully colonized America, Africa and South Asia, which was the motive force for survival. A large number of unemployed farmers who have no food and clothes in their hometown have become pioneers in the new world. This kind of situation will not happen in China, because it is precisely because of the deep-rooted concept of mainland culture that abandoning the old country and going to a foreign land is more terrible for China people than death. Although businessmen have gone overseas to seek wealth since the Song and Yuan Dynasties, these people are not the mainstream of the country after all. In the stable environment of feudal society, from kings to CoCo Lee, they had to change their minds when they were hungry and cold because the mainland culture was content with the status quo. However, this change is also like repeating the inertia of the periodic law of the rise and fall of the dynasty. It seems that the soil in the field is turned up and down, and then you can continue sowing. There is nothing new, because the cultural pattern restricts new ideas, and no one will think about what is not enough. Why not go into business? There is a large population at home, so why not look for opportunities outside?

At the time of the demise of the dynasty, the civilized countries in the mainland did not look for a way out, but clung to the land until death came. This is basically a common problem in mainland countries.