The city-states of sumer, the worlds earliest civilization, developed in

The city-states of Sumer, the world's earliest civilization, developed in Mesopotamia, which is today's Iraq. 

Urban growth invariably feeds increased commercialization and industrialization. it requires continually expanding land areas. when urbanization rates are high, and countries do not have the institutional and managerial capacities or economic wherewithal to manage such rapid growths, they exert intense pressure on the types and nature of the resulting settlements. they contribute to the development of overcrowded slums and shanty towns without adequate essential services and necessary infrastructure.-by asit k. biswas and cecilia tortajada

The answer is to spread the world of christ