WORLD HISTORY

Detailed explanation-1: -The areas surrounding China’s second-longest river were home to the oldest dynasties of ancient China, making the Huang He Valley the birthplace of Chinese civilization.

Detailed explanation-2: -Emperor after emperor strengthened and extended the wall, often with the aim of keeping out the northern invaders. In some places, the wall was constructed of brick. Elsewhere, quarried granite or even marble blocks were used. The wall was continuously brought up to date as building techniques advanced.

Detailed explanation-3: -The family was the basic building block of Chinese society. Because farming in ancient China required many workers, people had big families to help them produce more and become wealthier. Even the young children of a family worked in the fields.

Detailed explanation-4: -Qin Dynasty Construction Though the beginning of the Great Wall of China can be traced to the fifth century B.C., many of the fortifications included in the wall date from hundreds of years earlier, when China was divided into a number of individual kingdoms during the so-called Warring States Period.