The earliest Mesopotamian civilization

The first Mesopotamian empire dating back to 3000 B.C. was the Sumerian civilization. They are known by some historians to be the earliest known civilization of human history. Along with all the other earliest civilizations they formed social classes. Since the rivers would run low and would flow over with silt they grew there crops when the time was right. Over time they learned how to build dams and to control irrigation. Because of the irrigation not everyone had to farm. Leading into new jobs as skilled workers. Now artisans would come together in areas that favored trade. Making some of the first cities,the Sumerians made the first cities in southwest Asia. Since there was large distances between each city they became independent cities not one unified country. As a result we get city-states. Each city had 5000-20000 people, each city state was protected out of a large sun dried brick wall. The city-states would go to war and trade with each other. Some city-states formed alliances to help in war. The Sumerians had a a god that would control different parts of life. The belief in more than one god is polytheism,most of Mesopotamia worshiped one or more god. They would worship in large temples called Ziggurats that were usually in the middle of the city and the tallest in the city. The Sumerians formed a writing called cuneiform. That was written by trained people called Scribes. They also made a 12 month calendar,60-second minute,60-minute hour, a 360 degree circle,and a place value system based of 60.