Why is the eastern part of China densely populated?

The distribution of population is mainly determined by the environment.

The climate in eastern China is warm and humid, which is suitable for agricultural development. Since ancient times, the population has a strong carrying capacity and the largest population. The harsh climate and barren land in the west are not suitable for human habitation. For example, the climate in Xinjiang, Inner Mongolia, Gansu and other places is too dry, lacking water and rain, and the proportion of cultivated land is very small, which can't support a few people. Tibet belongs to the high mountains, where trees can hardly be found. Although the total area is very large (10.2 million square kilometers), only 500,000 square kilometers of grassland can be used to develop animal husbandry, and the rest are mainly rocky mountains, where nothing grows. Qinghai is similar to Tibet. Grassland can only carry two people per square kilometer, otherwise the ecology will be destroyed. As for the desert, it is impossible to live in it. Most areas in the west are grasslands and deserts. Can't carry too many people. Because China has long been a unified multi-ethnic country, people from the western region are easy to migrate to the eastern region, so now there are more than 654.38+02 billion people living in the eastern region of China with only 4 million square kilometers of land.

But even uninhabitable places may contain rich mineral resources, which is the most important foundation for the development of modern society. Just like Saudi Arabia, the largest oil country in the world, its huge wealth comes from the desert. Even without any resources, these lands can play the role of defending the enemy and must not be ceded to any country. What's more, with the progress of science and technology, these lands unsuitable for human habitation can also be transformed into paradise on earth in the future. In fact, scientists are studying how to make Mars suitable for human habitation, but the South Pole on Earth is better than any other place on Mars.