Why did human beings develop in the Yellow River valley and not in the Yangtze River valley in ancient China, especially during the Spring and Autumn Period and the Warring States Period?

First of all, from the geographical analysis:

The Yellow River basin is plain, while the Yangtze River basin is hilly and dangerous. According to the living environment in ancient times, whether it is production and life or ethnic exchanges, plain life is naturally superior to hilly and mountainous life. The main evidence is that the four ancient civilizations all originated in the plain.

Secondly, from the environmental analysis:

In ancient times, at least a thousand years ago, the ecology of the Yellow River was not as bad as that of modern times. The four seasons changed obviously. In winter, the river was frozen, and the two sides of the Yellow River could communicate across the river. The climate is relatively dry, suitable for storing substances; There are not many forests, which are easy to prevent wild animals from attacking; The soil is good and suitable for planting. The environment in the Yangtze River basin is much more complicated. First of all, the air humidity is high, which is not easy for the most critical lifestyle of human early life: storage. Thirdly, the Yangtze River basin is fast-flowing, and there is no ice age all year round, which makes cross-strait communication inconvenient; The Yangtze River basin is densely forested, fertile and complex, which makes it difficult for early humans to adapt. There are cockroaches and poisonous mosquitoes in the air, leeches in the soil and poisonous snakes and beasts in the mountains, which have great influence on people's production, life and communication.

Therefore, from the early geographical environment, the Yellow River basin is superior to the Yangtze River basin. So if you have a choice, the Yellow River basin is naturally the first choice for survival.

Literally, "chasing deer in the Central Plains" means chasing deer on the plains, which means that countries competed for hegemony in the Central Plains during the Spring and Autumn Period and the Warring States Period. Among the seven countries, the only Chu State in the Yangtze River Basin.

Therefore, the ancient history of China began with the Yellow River; "Competing for the Central Plains" is also limited to the Yellow River Basin.

So, when did China's economic center of gravity move south?

It is generally believed that it began in the Song Dynasty.

Most of the land in the Song Dynasty was in the south, and the north was gradually eroded by nomadic people. Historically, the economy and foreign trade of the Southern Song Dynasty were highly developed. At that time, with the progress of science and technology and culture, people's lives basically overcame the ancient people's fear of the south. Agricultural handicrafts flourished in the Song Dynasty, which promoted the prosperity of other industries. At this time, Hangzhou and Yangzhou were already the economic and cultural centers of the whole country, and the water transport in the Yangtze River basin promoted the development of the south, and the rich resources and fertile soil were also reasonably applied.

After the north was occupied by nomadic people, agriculture or handicraft industry regressed or stopped. After 300 years of operation in Song Dynasty, the south was extremely rich, while the north began to lag behind.

Since then, Chu is no longer a symbol of barbarism. "Only Chu Youcai" has lived up to its reputation ever since.

Now answer the third question: Why do you always build more capitals in the north?

Most ancient dynasties in China were established by northerners, especially the influential dynasties, except the Ming Dynasty. This is related to the living location of the ancients, which has been described above. Generally, the dynasty established by northerners must like the life and environment in the north and dislike the environment in the south, so the capital city is in the north. Because the Ming Dynasty was founded by southerners, Nanjing was called the capital of the Ming Dynasty. After Jing failed, he moved back to the north. First of all, Judy has lived in the north for a long time, adapted to and governed the north. Second, because the north is the focus of national defense in the Ming dynasty, there is a saying in the Ming dynasty: the emperor protects the country and the king dies.

According to the above analysis of personal knowledge and opinions, please advise if there are any shortcomings.

There were a lot of arguments to talk about, but I was tired after playing for more than an hour, so that's it.