Urbanization: a metropolitan area or metropolis is a densely populated core area, together with adjacent communities. Within these metropolitan areas, there has been a dramatic population shift from the cities to the suburbs. Those who move to the suburbs are predominantly upper middle class, middle class, and to a lesser extent working class whites: urban sprawl refers to the low-density, automobile dependent development outside the central city. Urban sprawl absorbs farmland at a rate of about 50 acres an hour in the u. s. , an area the size of. A slum section of a city occupied primarily by a minority group is referred to as a ghetto. U. s. minorities, who are disproportionately represented among the poor, tend to be segregated in concentrated areas of low-income housing. These empowerment zones stimulate the local economy, provide jobs for the unemployed, and increase city revenues.