Why do people live in cities and when did they start? Before urbanization, people where clustered in agricultural villages and were centered around crop production and farming. They had to focus all their time on making enough food to survive another year. The first urban revolution had two components that allowed cities to start to form: agricultural surplus, and a leadership class emerged. This happened all across the world but had five main hearths. Mesopotamia, the Indus River Valley, the Huang He, and Mesoamerica are these hearths. Peru is listed as the sixth hearth but their founding was recent compared to the others. Greek and Roman cities followed these hearths of …show more content…
Around the city is a preindustrial periphery that housed poorer people. After that is a postindustrial suburb ring that came into being in the 20th century. In America, cities have expanded out due to the personal automobile. Suburbs are taking over in jobs and population. North American sociologists came up with the concentric, sector, and multiple nuclei models. South American cities are centered around a very important CBD but have a lot of shantytowns around the periphery. African cities have had the lowest level of urbanization, but are now the fastest growing cities. The impact of the Europeans and western world are seen at the city centers. They contain three CBD’s (Central Business Districts). Southeast Asian cities are some of the most populous. There is no formal CBD, but elements of it can be found throughout the