The Xia tribe that lay near the banks of the Yellow River had a more advanced development than the groups living in the west. This can be explained by the fact that the groups living west of the river encountered the most adverse geographical conditions since the more the west of China you go the less rainfall and severe droughts in that region of the country are observed. And with the domination of the regions the margin of the yellow river by the tribe Xia, it was possible to dedicate to the cultivation of food, mainly rice and other cereals.
