The Great Wall
The Wall was built over a long period of time. During the Warring States period (475-221 BC), the first wall was built to prevent raids from northern tribes. The Warring States period was ended by the victory of Qin Dynasty. The emperor of Qin spent 10 years to build a new wall to prevent from attach from invaders. The new wall stretched over 10,000 Chinese miles. Therefore, it is called 万里长城。(wàn lǐ cháng chéng). 万里 means 10,000 Chinese miles. In these 10 years, there were as many as 3 million laborers worked on the wall, of whom a third died.