& There is chaos on the Dongwu side, but there is a busy scene on the Jingzhou side. ◎ All shipbuilding-related industries are working overtime to produce at full capacity, the water, land and air forces are stepping up training, and the logistics departments are also running at a high speed.

Liu Hou took his ministers and three queens to Jingzhou, this time Liu Hou planned not to destroy Wu and not leave Jingzhou, that is, he was going to stay in Jingzhou for a long time, so he divided the entire court into two, one part was the war-related departments and officials, and followed him to Jingzhou.

The remaining half of the imperial court, which was not so related to the war, began to move the capital in Xuchang. After thinking about it for a while, Liu Hou decided to set the capital in Chang'an, so this half of the imperial court will be relocated to Chang'an one after another in the next few months.

The reason for choosing Chang'an is based on many considerations, the Guanzhong area where Chang'an City is located is closed and easy to secure, and there are Hangu Pass, Tongguan Pass, and Linjin Pass in the east; There are Wuguan, Yaoguan in the south, and Qinling, Lishan and Zhongnan Mountain are the main peaks on the Qinling Mountains; In the west, there are Sanguan and Longguan, which are the dividing line between the north and south of our country; In the north, there is Xiaoguan.

If Guanzhong is regarded as a large city, then there are mountains in the southeast, northwest, and northwest directions of this large city as natural city walls, and the above-mentioned pass is the gate of this large city. These mountains enclose Guanzhong in the middle, making Guanzhong much safer than other areas.

As long as troops are sent to hold the passes in four directions, it will be very difficult for the enemy to attack the passes. Even if the Hong army had so many firearms, Liu Hou did not dare to attack Guanzhong by force, but used a strategy against Cao Hong, thus opening a gap to enter Guanzhong.

The stability of Guanzhong can be seen. Guanzhong has a high safety factor, the traffic is also good, Chang'an is located in the country, the southwest communicates Bashu, the southeast connects the Jianghuai, the northwest can reach the Western Regions, and the northeast is the North China Plain, which is conducive to controlling the whole country.

As a capital city, in addition to the two conditions of safety and transportation, economic conditions are also things that have to be considered. Later generations may have the impression of the northwest of the country that there are thousands of ravines and dust, but that is because after thousands of years of overdevelopment, soil erosion and environmental degradation in the Guanzhong area have led to it.

The ecological conditions in the Guanzhong area used to be quite good, the terrain was flat, there were many rivers, the climate was warm and humid ~ moist, there were large ~ bamboo forests, elephants, macaques and other wild animals lived, and the vegetation coverage rate exceeded 50%.

Zhang Heng once said that Guanzhong is "above Kyushu", and "New Tang Dynasty Book" said that "Guanzhong is known as fertile field". The territory of the Qin State is not large, but it can maintain hundreds of thousands of troops and eliminate the six countries of Kwantung, and the rich Guanzhong and Bashu are economic security.

Chang'an City in the Han and Tang dynasties was like the current Beijing, Shanghai, Guangzhou, and Shenzhen, and for foreigners in Japan, Silla and other places at that time, Chang'an City was even equivalent to the status of New York now, and the holy place in their minds.

Chang'an City played a pivotal role in the first half of Chinese history, especially in the Tang Dynasty, when Chang'an City covered an area of 84 square kilometers, which was 1.4 times the size of Beijing in the Ming and Qing dynasties, 2.4 times the size of Chang'an in the Han Dynasty, 5 times that of Rome, 6 times the size of Baghdad, and 7 times that of Constantinople, with a population of more than one million at its peak, which was considered the largest city in the ancient history of the world

It's a pity that later people in order to survive, but also for the benefit, exhausted the fish, squeezed the environment, benefited a generation, disaster to the descendants, after overdevelopment, Chang'an around the vegetation destruction, soil desertification, rivers dried up, natural disasters are more frequent, so after the Tang Dynasty, Guanzhong this place, finally ruthlessly abandoned by the ruling group, lost the qualification as the imperial capital.

To sum up, the decline of Chang'an City and its loss of qualification as an imperial capital were mainly due to the decline of the economy. The decline of the economy is mainly caused by two aspects, one is the destruction of war; The second is related to the laws of nature: agricultural production is damaged by the deterioration of the environment caused by overexploitation.

As the imperial capital, it was the economic, political and cultural center of the country, and the population here was concentrated, according to records, during the Tang Dynasty, its population was about 500,000 (some sources believe that the population of Chang'an City exceeded 1 million at its peak).

Of course, being the imperial capital also means having a larger non-agricultural population and greater food consumption. On the one hand, food consumption is increasing, and on the other hand, because of environmental degradation, food production is decreasing, so the question is, which excavator is there

Oh no, it has nothing to do with excavators, soil erosion can't solve the problem even if there are excavators, and the solution you can think of at this time is naturally to transport grain from other places to Guanzhong.

So Yang Guang did his best to build the Grand Canal, so Caoyun came into being. At this time, Chang'an began to gradually become less suitable as the imperial capital, and it must be safe as the imperial capital, no matter how chaotic it is outside, it can be safe and sound inside. Autarky.

In the past, the terrain alone could bring a sense of security to Guanzhong, and that was because Guanzhong was still self-sufficient at that time. Since Guanzhong is not self-sufficient, this sense of security is about to be lost. Because at this time, if there is chaos outside, the grain cannot be transported, and the inside will also be chaotic, which is very understandable.

Even, if there are careerists who deliberately cut off the transportation of Cao, so that the grain from outside cannot be transported in, it can also make Guanzhong chaotic or even self-defeating.

Liu Hou knew the pros and cons of Chang'an as the imperial capital, but he thought twice and decided to make Chang'an the capital. Because the fatigue in Guanzhong is a matter after the Sui and Tang dynasties, it is still far from now.

The current Guanzhong area is still relatively rich, the population is not too large, and this place can maintain prosperity for at least a few hundred years. What happened hundreds of years later, leave it to future generations to worry about, no one can say whether the Han Dynasty will still exist by that time.

Moreover, now that he knows the reason why the Guanzhong region has turned from prosperity to decline, what if he starts taking measures to prevent this from happening now? Is it possible to delay or even stop the decline of Chang'an?

He could issue a decree prohibiting over-cultivation in the Guanzhong area, so that people can take care of the environment, increase the rate of greening, and prevent soil erosion. In fact, increasing greenery in the upper reaches of the Yellow River and conserving water and soil are also key links in the management of the Yellow River.

The large amount of soil erosion on the Loess Plateau is the main reason why the Yellow River contains a large amount of sediment, which is also one of the reasons for the accumulation of sediment in the lower reaches of the Yellow River to form an above-ground river. Therefore, it is necessary to carry out environmental management in the upper reaches of the Yellow River as soon as possible.

He can also move the population on a regular basis to prevent over-concentration of population in the Guanzhong area and reduce food consumption in Guanzhong. For others, the forced migration of the population was difficult, but for a strong emperor like Liu Hou, it was not a big problem.

Of course, the most important thing is that he, as a former emperor, can set the rules and act as an "ancestral system" for the later emperor to continue to implement these policies. However, given that things are constantly changing, and his considerations are not necessarily correct and comprehensive, it may become inappropriate to leave the rules for future emperors to enforce.

In this case, he can also consider leaving some texts to analyze the problems that Guanzhong may face, as well as the solutions he has thought of, so that future emperors can use them as references.