: In 221 BC, Qin Shi Huang , the first emperor of a unified China, connected existing walls and expanded them to create a northern defense line against nomadic tribes like the Xiongnu.
The construction of the wall was not a single event but a continuous process that spanned from the to the 17th century AD . Г‡in Seddi (The
The wall served as more than just a barrier; it was a complex military system. : In 221 BC, Qin Shi Huang ,