A Cultural History of China Post-Course Exercises by Zhang Tianyu Why did the center of culture in ancient China shift southward?

The development of culture depends on economic prosperity, that is to say, economy determines culture, and culture has a certain time lag for its determinants. So the southward movement of the cultural center is actually the southward movement of the economic center, of course there may be a time difference between the two. Similarly, the economy is determined by geography, but of course social development and other human factors also affect the geography.