Ethnicity
The history of the Great Wall can be traced back to the Warring States period, when various vassal states built some walls to resist foreign enemies. After Qin Shihuang unified the six countries, in order to strengthen border defense, he began to build the Great Wall. This section of the Great Wall is mainly composed of adobe and stones, and its main purpose is to defend tarkan. In the Han Dynasty, the Great Wall gradually extended to the north, and at the same time began to adopt masonry structure to make it stronger. During the Tang Dynasty, the scale of the Great Wall was further expanded, reaching the distance of Wan Li. During the Ming Dynasty, the construction of the Great Wall reached its peak, and its scale and structure were further improved and perfected.
building technology
The Great Wall was built by various technologies, mainly including stone walls, earth walls, masonry structures and beacon towers. Among them, the stone wall is one of the most common structures of the Great Wall, which is made of stone and gypsum. The earth wall is made of adobe, vegetation and other materials, and its main advantages are easy construction and low cost. Masonry structure is made of bricks and stones, and its main advantage is its durability. Beacon tower is an important part of the Great Wall, and its main purpose is as a tool for warning and communication.