Topic 6.1 Notes – The Origin and Influences of Urbanization

What Urbanization and Suburbanization Are

An urban settlement is a large, dense, concentrated place where most people do nonfarm work. Cities have specialized jobs, services, institutions, and infrastructure like roads, schools, hospitals, and utilities.

A quick APHG reminder. Urban does not have one worldwide population cutoff. Countries define it differently, so always think in terms of density, concentration, and nonagricultural activity.

• Urbanization means the percentage of people living in urban areas increases.
• Urban growth means the number of urban residents increases.
• Those are related, but they are not the same.
  • A country can have urban growth without much urbanization if the rural population is also growing fast.

Urbanization can happen through several processes:

• Rural-to-urban migration as people move to cities for jobs and services
• International migration into cities
• Natural increase when births in urban areas exceed deaths
• Annexation or expansion of city boundaries
• Reclassification when a place gets counted as urban

Suburbanization is different. It means people, jobs, and businesses move outward from the central city into nearby suburbs. Those suburbs are still part of the larger urban area.

Why Cities Started and Why They Formed Where They Did

Cities first became possible when agriculture produced a surplus. Once enough food existed, not everyone had to farm. Some people could become rulers, merchants, priests, craftspeople, or soldiers.

This early city development is the first urban revolution. Major hearths appeared in Mesopotamia, the Nile Valley, Indus Valley, northern China, Mesoamerica, and the Andean region.

Five early urban hearths with approximate dates (the Andean hearth is not shown)

Cities needed more than food:

• occupational specialization
• trade
• political or religious authority
• storage systems
• social classes
• infrastructure and defense

A standard example is Ur in Mesopotamia. Irrigated farming supported food surplus, and the city became a center of religion, administration, and trade.

Site and situation

Site means the physical characteristics of the place itself. Think water supply, fertile soil, harbor, hill, river crossing, minerals, or flood risk. Site often explains why a city started there.

Situation means the city’s relative location compared with other places and networks. Think markets, ports, railroads, highways, borders, labor, and investment. Situation often explains why a city later grew.

Chicago

Chicago is the classic example because it shows both ideas clearly.

• Site: on Lake Michigan, near the Chicago River, with a low portage
• Situation: connected the Great Lakes to interior U.S. markets

The Illinois and Michigan Canal and later railroads improved Chicago’s access, which turned it into a huge transport and trade center.

Main Drivers of Urbanization

Cities grow because several forces reinforce each other.

Transportation

Transportation often works like this:

1. A new route or facility improves accessibility.
2. Firms locate there.
3. Jobs increase.
4. Migrants arrive.
5. Housing and services expand.
6. More investment follows.

Break-of-bulk points matter a lot. Ports, rail terminals, and river crossings create jobs because goods must be transferred there. Know canals, railroads, streetcars, highways, container ports, and air travel.

Communication

Telegraph, telephone, internet, and fiber optics help cities coordinate trade, finance, and government. They can strengthen major cities, but they can also let some activities spread outward into suburbs.

Population growth, migration, economic development, policy

• Natural increase adds urban residents from within the city.
• Migration brings people in, especially rural-to-urban and international migrants.
• Industrialization drove the second urban revolution by concentrating factory jobs in cities.
• Agglomeration economies mean firms cluster to share labor, suppliers, infrastructure, and information.
• Deindustrialization can slow growth or cause decline.
• Government policy shapes growth through capitals, zoning, infrastructure, annexation, subsidies, and migration policy.

Examples you should know:

• Shenzhen grew fast after China made it a Special Economic Zone near Hong Kong.
• Brasília was a planned capital created by government decision.

What Drives Suburbanization

Suburbanization means residences, businesses, and services shift outward to the urban fringe.

Major causes include:

• early streetcars and commuter rail
• later automobiles and highways
• larger or cheaper land
• lower-density preferences
• jobs moving outward
• expansion of schools and utilities
• mortgage and tax policy
• telecommunications

The classic U.S. case came after World War II:

• Levittown showed mass-produced suburban housing.
• Federally backed mortgages made homeownership easier.
• The Federal-Aid Highway Act of 1956 made commuting easier and sped outward growth.

This pattern is not universal. In some countries, wealthy groups stay in central locations and poorer residents live on the edge.

How to Explain Urban Growth on the Exam

Strong AP answers show interaction, not isolated facts. A city usually grows because several causes connect.

Good phrasing sounds like this: transportation improved a city’s situation, which attracted firms, which created jobs, which drew migrants.

Change over time matters too:

• Early cities depended on farm surplus, water, defense, and trade.
• Industrial cities grew through coal, factories, railroads, and ports.
• Contemporary cities grow through highways, airports, telecommunications, services, and global investment.

A common FRQ mistake is listing site, situation, migration, and policy without showing the chain of cause and effect.