studying about the great wall

Shi Huangdi wanted a long wall along China's northern borders to keep out nomadic invaders. He planned the Great wall, which linked together smaller walls built during the Time of the Warring States. The earliest walls were built of earth. Later,stone and brick were used.
Shi Huangdi forced hundreds of thousands of peasants and criminals to build the Great Wall. Many workers died from hard labor. The deaths caused great resentment among people. Later dynasties rebuilt and extended the Great Wall many times.