The scarcity of natural resources on the plain made it necessary for a powerful elite to emerge and take charge of trade and imports. | The economy of each city was based on a craft such as pottery or metal working, and the city of Eridu was known for its saws, scythes and weaponsand weapons. | Writing appeared in the form of logograms and later developed into a system using signs to represent syllables rather than whole words. | Priests were powerful figures in the ancient civilization and controlled the political and economic life of the cities. | The earliest city states had one or more patron gods and were built around central temple complexes. | The development of the wheel and the creation of bronze were important innovations in Sumer |
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