Exploring the Tendency of Han Nationality Towards Minor Nationalities in the Area to the North of the Yellow River from the Period of North Wei to Mid-tang Dynasties

Since the period of North Wei dynasty,the minor nationalities had ruled the area to the north of the Yellow River many times,but then the culture of Han nationality was still much higher than that of the minor nationalities.However,from the early period of Tang dynasty,owing to the political,military,social and economic factors,Han's culture gradually got declined,which caused the main leading culture there to tend towards that of minor nationalities.