United States

Within many urban sites there has been radical physical transformation of shoreline, drainage systems, and land surface that would be difficult to match elsewhere in the world. Thus, in their physical lineaments, Manhattan and inner Boston bear scant resemblance to the landscapes seen by their initial settlers. The surface of downtown Chicago has been raised several feet above its former swamp level, the city’s lakefront extensively reshaped, and the flow of the Chicago River reversed. Los Angeles, notorious for its disregard of the environment, has its concrete arroyo bottoms, terraced hillsides and landslides, and its own artificial microclimate.

The supercities

The unprecedented outward sprawl of American urban settlement has created some novel settlement forms, for the quantitative change has been so great as to induce qualitative transformation. The conurbation—a territorial coalescence of two or more sizable cities whose peripheral zones have grown together—may have first appeared in early 19th-century Europe. There are major examples in Great Britain, the Low Countries, and Germany, as well as in Japan.

Nothing elsewhere, however, rivals in size and complexity the aptly named megalopolis, that supercity stretching along the Atlantic from Portland, Maine, past Richmond, Virginia. Other large conurbations include, in the Great Lakes region, one centred on Chicago and containing large slices of Illinois, Wisconsin, and Indiana; another based in Detroit, embracing large parts of Michigan and Ohio and reaching into Canada; and a third stretching from Buffalo through Cleveland and back to Pittsburgh. All three are reaching toward one another and may form another megalopolis that, in turn, may soon be grafted onto the seaboard megalopolis by a corridor through central New York state.

The city of Chicago accounts for a large share of Illinois's population and economy.© Rvaero/Dreamstime.com

Another example of a growing megalopolis is the huge southern California conurbation reaching from Santa Barbara, through a dominating Los Angeles, to the Mexican border. The solid strip of urban territory that lines the eastern shore of Puget Sound is a smaller counterpart. Quite exceptional in form is the slender linear multicity occupying Florida’s Atlantic coastline, from Jacksonville to Miami, and the loose swarm of medium-sized cities clustering along the Southern Piedmont, from south-central Virginia to Birmingham, Alabama; also of note are the Texas cities of Dallas–Fort Worth, Houston, and San Antonio, which have formed a rapidly growing—though discontinuous—urbanized triangle.

Santa BarbaraSanta Barbara, California.Skyguy414

One of the few predictions that seem safe in so dynamic and innovative a land as the United States is that, unless severe and painful controls are placed on land use, the shape of the urban environment will be increasingly megalopolitan: a small set of great constellations of polycentric urban zones, each complexly interlocked socially and physically with its neighbours.

Traditional regions of the United States

The differences among America’s 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 mobility, a superb communications system, and the galloping centralization of economy and government. It might even be argued that some of these regions are quaint vestiges of a vanishing past, of interest only to antiquarians.

Yet, in spite of the nationwide standardization in many areas of American thought and behaviour, the lingering effects of the older culture areas do remain potent. In the case of the South, for example, the differences helped to precipitate the gravest political crisis and bloodiest military conflict in the nation’s history. More than a century after the Civil War, the South remains a powerful entity in political, economic, and social terms, and its peculiar status is recognized in religious, educational, athletic, and literary circles.