A drought happened, and the weaker group could not get enough resources for their population. Eventually, they took over and expanded the territory into less fertile lands, where they used irrigation to provide good grounds for planting. The population grew, and this place formed hierarchies and a non-centralized government that was political, not controlling or religious. Like their predecessors, this place forcused on ancestral worship and bronze. Instead of constantly expanding, they focused on stabilizing their current lands. They eventually fell because of steppe peoples.