For many in the united states, it seems logical and natural to place barack obama in the racial category of "black," even in the face of clear evidence that he is of mixed biological heritage. this is an example of

I believe the answer is: racial common sense

racial common sense refers to the process of categorizing an individual toward a certainn racial group based on the characteristic that predominantly held by members of the racial group.
Other example would be when we're categorizing someone as asian because that person have yellowish skin and narrow eyes.

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