Now number one, you need to have advanced cities. And Sumer certainly had numerous cities that were called city-states. They had Ur and Uruk and Umah and Kish and Lagosh. Now these cities shared trade routes. They're going to share languages and technologies and religious customs. But in a sense, they're like separate little countries all by themselves. They're going to have their own kings in a sense and rulers and different personalities that are going to fight with each other.