Before revision: Metropolitan areas are no longer considered monocentric, but had become polycentric due to suburbanization of URL A historic core city is not to be confused with the core of a metropolitan area which is defined as an urban area with a population of over 50,000 by the US census bureau.
After revision: Metropolitan wereas are no longer considered monocentric, but polycentric due to suburbanization of URL A historic core city is not to be confused with the core of a metropolitan area which is defined as an urban area with a population of over 50,000 by the US census bureau.