The economy of the united states is highly developed and mixed it is the worlds largest economy by nominal gdp and net wealth and the second largest by purchasing power parity ppp it also has the worlds eighth highest per capita gdp nominal and the tenth highest per capita gdp ppp in 2018. This is a list of some of the regions in the united statesmany regions are defined in law or regulations by the federal government others by shared culture and history and others by economic factors world interstate regions census bureau designated regions and divisions. Generally a states exclusive economic zone is an area beyond and adjacent to the territorial sea extending seaward to a distance of no more than 200 nmi 370 km out from its coastal baseline the exception to this rule occurs when exclusive economic zones would overlap that is state coastal baselines are less than 400 nmi 740 km apart. United states united states traditional regions of the united states the differences among americas traditional regions or culture areas tend to be slight and shallow as compared with such areas in most older more stable countries the muted often subtle nature of interregional differences can be ascribed to the relative newness of american settlement a perpetually high degree of . The emergence in the united states of large scale megaregions centered on major metropolitan areas is a phenomenon often taken for granted in both scholarly studies and popular accounts of contemporary economic geography this paper uses a data set of more than 4000000 commuter flows as the basis for an empirical approach to the identification of such megaregions we compare a method
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