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1970年 ,美国率先成为一个郊区化的国家 ,这与美国现代技术进步、经济发展、联邦政策以及美国的社会特征有着密切的关系。交通、通讯和能源技术的改进 ,为人口和产业向郊区的迁移提供了必要的前提 ;而经济结构的变化 ,比如企业规模、部门和地区结构的变化 ,使经济活动在郊区有更大的发展空间和效益 ;30年代大危机以来 ,联邦政府为了推动经济的发展和解决住宅问题 ,执行了一系列推动郊区化的政策 ,其中包括住宅抵押保险制度、住宅补贴制度和社区评估制度等 ;二战以来 ,黑人和少数民族在中心城的集中 ,加剧了美国城市种族矛盾 ,进一步推动了白人中产阶级的郊区化。
In 1970, the United States became the first country to become a suburban country, which has close relations with the U.S. modern technological progress, economic development, federal policies and the social characteristics of the United States. Improvements in transport, communications and energy technologies provide the necessary premises for the migration of people and industries to the suburbs. Changes in economic structure, such as the size of enterprises, changes in sectoral and regional structures, have led to greater economic activity in the suburbs Space and benefits. Since the great crisis of the 1930s, the federal government has implemented a series of policies to promote suburbanization in order to promote economic development and solve housing problems. These include the residential mortgage insurance system, residential subsidy system and community assessment system. Since World War II . The concentration of blacks and ethnic minorities in the Central City has aggravated ethnic conflicts in the United States and further promoted the suburbanization of the white middle class.