Megaregions of the United States

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"Megaregion" is a term proposed by the Regional Plan Association (RPA), an American think-tank focused on urban planning. The megaregions of the United States, as the RPA defines them, are 11 regions of the United States that contain two or more roughly adjacent urban metropolitan areas that, through commonality of systems, including transportation, economies, resources, and ecologies, experience blurred boundaries between the urban centers, being perceived and acting as if they are a continuous urban area. Such a region is also known as a "megalopolis", a term initially coined to define the Northeastern United States, which ranges from Boston in the north to Washington, D.C., in the south. That region has an estimated population of over 50 million people as of 2022 and includes some of the nation's largest cities, such as Baltimore, New York City, and Philadelphia.

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