The Development of the Concept of Metropolitan in U.S. and the Inspiration for the Urbanization of China

The metropolitan area of America has developed rapidly since the 20th century,resulting in the changing of concept and scope of the metropolitan area constantly.With the development of the metropolitan area,the concept of metropolitan area in the United States changes from the initial establishment of the concept of the metropolitan area to standardization and standardization of the concept,which analyzed the concept of metropolitan more accurately and clearly.The changes of the concept of metropolitan not only clarify the development of the metropolitan area,but also reflect characteristics of metropolitan development fundamentally in U.S.,which could provide a useful reference to the development of China′s urbanization.