These processes often occur in more economically developed countries, especially in the United States, which is believed to be the first country in which the majority of the population lives in the suburbs, rather than in the cities or in rural areas.
该过程经常发生在经济较发达的国家，特别是美国，据信美国是首个大多数人口居住在郊区，而非城市或农村地区的国家。