National relationships in Song,Liao,Jin and Yuan,Dynasties

In Song,Kiao,Jin and Yuan Dynasties,northern and northeastern minor nationalities in ancient China developed rapidly,political powers had been established,and ancient China experienced a prosperous period.The development of minor nationalities at that time contributed greatly to the advenced culture of Han nationality.Meanwhile,these minor nationalities played an important role in the economy of the middle part of ancient China,had made a great contribution to border areas in northern and northeastern parts of ancient China,and had merged into whole China forming important members of China.