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How can a metropolitan area include suburbs nearby towns and smaller cities?
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Crowds of people in Tokyo's Shibuya shopping district.
A metropolitan area is defined as a major city that exerts commanding economic and social influence over its surrounding suburbs, towns, and smaller cities. This integration occurs because the core city acts as a central hub, while the surrounding settlements function as dependent or interconnected parts of a larger, unified region.1
The expansion of these areas is often driven by urban sprawl, a process where the geographic footprint of a city grows rapidly. This is facilitated by several factors:2
- Infrastructure: The development of road networks, such as the Interstate Highway System, allows residents to live further from the city center while maintaining a connection via private automobiles.2
- Lifestyle and Economics: Many people move to suburbs to seek more living space, amenities, or to escape the congestion of the inner city.2
- Population Growth: Rising urban populations necessitate the expansion of residential areas into previously inaccessible land.2
Consequently, what begins as a single city often evolves into a sprawling metropolitan region where distinct settlements become functionally linked to the core.12