With Panlongcheng as their local center , the northerners politically and culturally dominated the local populace .
Northerners mined the middle Yangtze deposits in order to supply the bronze production of the Shang cities on the Central Plain .
With Panlongcheng as their local center , the northerners politically and culturally dominated the local populace , while they mined the middle Yangtze deposits in order to supply the bronze production of the Shang cities on the Central Plain .