Sketch of the Great Wall of China

Around 220 BC, during the Qin and Warring States eras, the earliest Great Wall of China was constructed. Several nations constructed walls to secure their boundaries before to union. It was first constructed out of earth and straw. When emperor Qin unified the states in 221 BC, Qin Shi Huang once more commanded the devastation of these fortifications since they had split his dominion. However, in order to secure his northern border, Huang commissioned the building of a large defensive wall that connected the fortifications lining the empire's northern frontier. The wall was primarily constructed to defend against the Xiongnu tribes in the north and northwest, where the Qin Dynasty fought them. Although not much of this wall is visible now, it served as the sketch for the Great Wall of China.

A complex network of more than 4,000 miles of roads and a freeway, the Qinzhidao or "Straight Line," that extended around 500 miles along the Ziwu Mountains were among the engineering marvels of the Qin Empire. Additionally, it serves as a means of delivering building supplies for the Great Wall of China. Border walls that linked to form the head of the Great Wall served as the empire's northern border markers. 300,000 men were dispatched to construct the Great Wall under the direction of Qin road builder Meng Tian, who also oversaw the transportation of supplies on the public roads. This Qin Dynasty wall's construction is thought to have claimed the lives of hundreds of thousands of people.

Nowadays, modern builders have adapted building techniques akin to the Qin Dynasty's usage of cast earth in an effort to resurrect environmentally friendly structures throughout the world like using soil to construct China's Great Wall. This method is considered to be fast and cost-effective.

In short, one of the famous achievements of the Qin Dynasty is the construction of walls that served as the sketch for the Great Wall of China.

• In 221 BC, Qin Shi Huang ordered the destruction of previously built fortifications and instead built a large defensive wall connecting the fortifications to secure his northern border.
• The complex network was built of more than 4,000 miles of roads and highways, Qinzhidao or "Straight Lines" spanned about 500 miles with 300,000 workers working under Meng Tian's supervision.
• Hundreds of thousands of people died during this construction.
• Today, the construction method of the Great Wall is still used by modern builders.