6.2. AP HUMAN GEOGRAPHY

6.2 Cities Across the World

Urban Growth Patterns

Urbanization and suburbanization exhibit significant variances depending on geographical regions. Core countries typically see more pronounced suburbanization, whereas countries in the periphery and semi-periphery often experience rapid urban growth. There is a noticeable increase in the prevalence of megacities and large urban regions across the globe.

Suburbanization and Urban Expansion

Suburbanization can be defined as the movement of populations from urban centers to the surrounding residential areas, known as suburbs. These suburbs maintain connectivity to urban centers for employment and services, yet they possess lower population density compared to urban cores. Urban areas are characterized by continuous outward expansion, spurred by population growth and advancements in transportation technologies.

Causes of Suburbanization

The phenomenon of suburban growth has significantly accelerated in numerous countries following the conclusion of World War II, driven by several key factors:

  • Economic growth leading to higher incomes.

  • Increased automobile ownership coupled with the construction of highways, facilitating commuting.

  • Implementation of government housing policies and loan programs promoting home ownership.

  • A societal preference for larger homes and more spacious environments.

Racial Tensions and White Flight

Racial tensions have also played a crucial role in suburban growth. During and after World War II, as African Americans migrated northward in pursuit of employment and better educational opportunities, many White Americans opted to move to the suburbs in an event commonly referred to as “White Flight.” This movement was often characterized by a desire to escape perceived social changes and to maintain certain demographic compositions in suburban areas.

Urban Sprawl

Urban sprawl refers to the rapid, outward expansion of urban areas into the adjacent rural land. This phenomenon is driven by multiple factors, including:

  • Lower land costs in regions outside city centers.

  • The reliance on a car culture combined with expansive highway systems.

  • Growing demand for single-family housing units.

  • Weaknesses in land-use planning and regulation.

Urban sprawl is associated with several consequences, such as increased travel times due to commuting and various environmental issues resulting from such expansion.

Leap Frog Development

Leap-frog development is a specific urban development pattern where new housing developments are established farther from the city center, thereby skipping over vacant lands that are closer to urban cores. This trend exacerbates urban sprawl and promotes greater reliance on automobiles as residents commute longer distances to access urban amenities.

Edge Cities

As cities continue to expand outward, new urban forms emerge, one of which is referred to as edge cities. These are typically defined as nodes of economic activity located at the periphery or outer edges of urban areas, often along major transportation corridors. Edge cities are usually not residential-centric but feature retail shops and office buildings to support employment opportunities.

Boomburbs

Boomburbs are rapidly growing suburban communities that have populations exceeding 100,000 residents, even though they may not be classified as the largest city within their metropolitan area.

Exurbs

Exurbs are defined as communities that lie beyond the suburbs, where the residents typically commute long distances to their jobs in urban centers. An example of this phenomenon is Myakka, where growth occurs as more individuals can work remotely, land is more financially accessible, and lifestyle preferences shift towards less densely populated areas.

Counterurbanization and Reurbanization

Counterurbanization (or deurbanization) denotes the movement of populations from urban centers to rural or suburban areas, whereas reurbanization refers to the reverse movement, wherein individuals move back into urban centers. These migratory patterns are often influenced by factors such as housing costs, lifestyle preferences, and shifts in employment opportunities.

Megacities and Metacities

A megacity is defined as an urban area with a population exceeding 10 million inhabitants, while a metacity is characterized by an urban area with a population greater than 20 million or consists of multiple interconnected cities.

Squatter Settlements

Squatter settlements are regions where individuals construct housing on land they do not legally possess, often lacking access to essential services such as clean water, electricity, and sanitation. The rapid pace of urbanization and the growth of megacities in developing nations often outstrip available housing and infrastructure, compelling many to establish squatter settlements on the outskirts of cities.

Current Trends in Megacities and Metacities

Currently, the majority of megacities are emerging in periphery and semi-periphery countries, primarily due to:

  • Accelerated rural-to-urban migration.

  • High birth rates in urban contexts.

  • Availability of economic opportunities in city environments.

The rapid growth associated with megacities can create substantial strains on infrastructure and housing resources, posing challenges for sustainability and urban livability.

Megalopolis and Conurbation

The term megalopolis denotes a chain of interconnected large cities, an example of which is the Bos-Wash corridor, stretching from Boston to Washington D.C., encompassing cities such as New York City, Philadelphia, and Baltimore, and currently housing over 50 million residents. On a broader scale, conurbation describes a continuous urban area that emerges as municipalities grow into one another, sharing transportation networks, economic spheres, and large populations.

Urban Challenges

Rapid urban growth is often accompanied by a range of urban challenges, including:

  • Housing shortages and lack of affordable options.

  • Traffic congestion that results from increased commuter traffic.

  • Pollution stemming from higher urban density and transportation needs.

  • Strains on infrastructure due to increased demand for services.

  • Inequitable access to municipal services and resources.

Cities must strategize for sustainable growth and development to address these challenges effectively.

Lesson Check

1. Process Explanation

Urban growth and suburbanization have led to new land-use patterns largely through mechanisms like suburbanization, which involves the migration of individuals moving from urban centers to surrounding residential neighborhoods. This contributes to city expansion as population densities shift outward, creating suburban enclaves. One notable impact on urban structure is the increased separation of residential and commercial areas, leading to sprawling urban landscapes.

2. Megacity Location Explanation

B. Rural-to-urban migration and high population growth are increasing city populations in developing regions best explains the location of many contemporary megacities in periphery and semi-periphery countries.