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Cleveland, Ohio, is typical of many American central cities; its municipal borders have changed little since 1922, even though the Cleveland urbanized area has grown many times over.[citation needed] Several layers of suburban municipalities now surround cities like Boston, Cleveland, Chicago, Detroit, Los Angeles, Dallas, Denver, Houston, New York City, San Francisco, Sacramento, Atlanta, Miami, Baltimore, Milwaukee, Pittsburgh, Philadelphia, Phoenix, Norfolk, St. Louis, Salt Lake City, Las Vegas, Minneapolis, and Washington, D.C..