The first known cities were built in approximately 4,000 BC. near the Euphrates River, in Mesopotamia, to take advantage of the fertile lands that surrounded it, thus, they planted from time to time, as civilizations were seminomadic. The purpose of the creation of cities was to have power in the hands of a single person and for that they built buildings surrounded by walls in order to surround their territory and have the city controlled by the king. This demonstrated his great dominion in pyramids, palaces, temples and other constructions.
The inhabitants of cities had the king as divine authority who represented the gods on earth and he lived in a palace together with their descendants and servants beside the temple of worship to the gods. He also had control over the region's granaries which stored large amounts of food and allowed his servants to divide it among the population in time of drought to increase his prestige and power.
The king ordered that he be paid a certain amount related to taxes, imposed laws that were comfortable for him, made the people work as a form of servitude and at the same time protected the people of external invasions that could happen. It was also up to the king to decide on war as a way of dominating and destroying other cities and killing those who went against his will.
The people already used animals to help them in the production and transportation of the harvest and were dedicated to handicrafts and commerce.