What are the pros and cons of the construction of the Great Wall by Qin Shihuang?

The Great Wall was built mainly to defend against the intrusion of the northern minorities into the Central Plains, and if you look at it from a military point of view, it was a positive and effective defense against the cavalry of the northern minorities in a military defense project. He saved perhaps more lives than the hundreds of thousands who died in the construction of the Great Wall, and also ensured the reproduction, development and growth of the Chinese farming civilization.

But, at that time, due to low productivity and lack of necessary technology and large-scale equipment, the construction could only be carried out by human labor in the mountains, which was undoubtedly cruel to the people who served in labor.

Many people look back on that period of history and blame it for the downfall of China's first great unified empire, but in fact we should also look at the greatness of Shi Huangdi, who built the Great Wall to protect the country from foreign peoples and the Straight Road, which greatly improved transportation throughout the country and greatly facilitated exchanges between different regions, much like today's highway network. If placed in today, these two things are undoubtedly good for the country and the people, perhaps the major television stations have to news daily rounds of broadcasting, but also to stimulate domestic demand, solve the problem of labor employment.

Of course, there is no denying that while the last two projects were being completed, Qin Shi Huang was also building palaces for his own enjoyment, such as the Afang Palace, and the domestic situation was volatile, with members of the royal families of all the former warring states, the old and the young, wanting to be restored all the time.

So, in my opinion, Qin Shi Huang is likely to be a person who crosses the line, but also a higher level of the kind, he was very discerning in the layout of the domestic, immediately after the unification of the center on the external defense work, and then understand "to get rich, the first to build the road," he began to build the national highway network. Unfortunately, he underestimated the determination of the remnants of the countries to subvert the Qin Dynasty, and disregard for people's livelihood, the projects forced on the horse, which led to the national uprising, which led to the destruction of the Qin Dynasty.