The Great Wall was originally a military defense project in ancient China, he began to build since the Western Zhou Dynasty, and later Qin Shi Huang unified the world, in order to resist the invasion of the Xiongnu, it was a large-scale construction of the Great Wall, to the fall of the Han Dynasty, the total length of the Great Wall built by the Qin and Han Dynasties exceeded 10,000 kilometers, and the dynasties that ruled the Central Plains almost all followed the method of Qin and Han, and have been consolidating the core of the Great Wall.
However, in modern times, many scholars have put forward the theory of the uselessness of the Great Wall, and a Japanese scholar even wrote in the book that there are three stupid projects in the world, namely the pyramids, the Yamato ship, and the Great Wall. So is the Great Wall useful in the end? Is it really just a stupid project? Surprisingly, Western scholars have refuted this view, arguing that China's construction of the Great Wall has harmed Europe.
At that time, the main role of the Construction of the Great Wall was to defend against the nomadic horses of the northern nomads. At that time, the nomads were born with a strong sense of crisis, and would constantly invade the surrounding countries to obtain resources and wealth to make up for the unstable shortcomings of the ancient nomadic industry, and after Qin Shi Huang built the Great Wall to defend, the steppe nomadic empire could not exploit the Central Plains Dynasty, and they could only focus on the European countries that had been dismissive.
This led to a round of exploited aggression in Europe, and some radical Western scholars believed that in Western civilization, Qin Shi Huang was actually a nasty ghost who caused misfortune to the west. Today's Great Wall does not play any role militarily, but the Great Wall is a witness to China's 500-year history, and now as a tourist attraction, it is also popular with the Chinese people.