First, that early proto-socialism was replaced by something that looked a lot like private enterprise, where people could produce as much as they would like as long as they gave a cut, also known as taxes, to the government. We talk a lot of smack about taxes, but it turns out they're pretty important to creating stable social orders. Things were also different politically, because the dudes who'd been the tribal chiefs became like full-blown kings who tried to extend their power outside of cities and also tried to pass on their power to their sons. The most famous of these early monarchs is Hammurabi, or as I remember him from my high school history class, the Hammer of Abbe. Hammurabi ruled the new Kingdom of Babylon from 1792 BCE to 1750 BCE. Hammurabi's main claim to fame is his famous law code, which established everything from like the wages of ox drivers to the fact that the punishment for taking an eye should be having an eye taken. Hammurabi's law code can be pretty insanely harsh, like if a builder builds a shoddy building and then the owner's son dies in a collapse, the punishment for that is the execution of the builder's son.