475-221 B.C. At this time, seven different tribes were fighting each other for land and power in China. Each ruler built small walls to protect themselves. Some of the rulers also buiit more walls to the north to keep their enemies out of China.
475-221 B.C. At this time, seven different tribes were fighting each other for land and power in China. Each ruler built small walls to protect themselves. Some of the rulers also buiit more walls to the north to keep their enemies out of China.