AP Human Geography – Urbanization and Megacities

AP Human Geography – Urbanization and Megacities

AP Human Geography Study Guide: Urbanization and Megacities

What This Is

Urbanization is the process by which an increasing percentage of a population lives in cities and suburbs, often driven by rural-to-urban migration and natural population growth. Megacities—urban areas with 10+ million people—are a key focus of this topic. On the AP exam, you’ll analyze why cities grow, how they’re structured, and the challenges they face (e.g., housing shortages, pollution, inequality). Example: Tokyo, the world’s largest megacity (37+ million people), grew rapidly after WWII due to industrialization and rural migration, leading to extreme density and advanced public transit systems.

Key Terms & Concepts

• Urbanization: The shift of population from rural to urban areas, increasing the proportion of people living in cities.
• Megacity: A metropolitan area with 10+ million residents (e.g., Mumbai, São Paulo, New York).
• Metacity: A city with 20+ million people (e.g., Tokyo, Delhi).
• Urban Sprawl: The uncontrolled expansion of urban areas into surrounding rural land, often characterized by low-density development (e.g., Los Angeles).
• Primate City: A city that is disproportionately larger than any other in its country (e.g., Paris in France, Bangkok in Thailand).
• Rank-Size Rule: A pattern where the nth largest city in a country is 1/n the size of the largest city (e.g., if the largest city has 1 million people, the 2nd largest has 500,000). Not all countries follow this!
• Central Place Theory (Christaller): Explains the spatial distribution of cities based on range (max distance people will travel for a good/service) and threshold (minimum population needed to support a business).
• Bid-Rent Theory: Land value decreases as distance from the central business district (CBD) increases, leading to concentric zones of land use (e.g., retail in CBD, industry in mid-rings, housing in outer rings).
• Gentrification: The process where wealthier residents move into a low-income neighborhood, displacing original residents due to rising rents (e.g., Brooklyn, NY; Portland, OR).
• Squatter Settlements (Informal Housing): Illegal or unplanned neighborhoods in cities, often lacking basic services (e.g., favelas in Rio de Janeiro, slums in Mumbai).
• New Urbanism: A planning movement promoting walkable, mixed-use neighborhoods to reduce sprawl (e.g., Celebration, Florida; Portland’s transit-oriented development).
• World City (Global City): A city with major influence in global economics, politics, or culture (e.g., New York, London, Tokyo).

Step-by-Step: Analyzing Urban Patterns on the AP Exam

1. Identify the Model
2. Look at a city map or data table. Ask: Does this city follow the concentric zone model (Burgess), sector model (Hoyt), or multiple nuclei model (Harris & Ullman)?
3. Concentric Zone: Rings (CBD-transition zone-working-class-suburbs).
4. Sector Model: Wedges (e.g., industry along a railroad, wealthy along a highway).

5. Multiple Nuclei: Multiple centers (e.g., a port, a university, a mall).

6. Compare to Real-World Examples

7. Chicago (1920s): Classic concentric zone model.
8. Mexico City: Sector model (wealthy along Paseo de la Reforma, poor in outer rings).

9. Los Angeles: Multiple nuclei (Hollywood, downtown, Santa Monica).

10. Explain Urban Challenges

11. Megacities: Traffic congestion (e.g., Jakarta’s 3-hour commutes), air pollution (e.g., Delhi’s smog), housing shortages (e.g., Hong Kong’s 200 sq. ft. "coffin homes").

12. Squatter Settlements: Lack of sanitation (e.g., Kibera in Nairobi), vulnerability to disasters (e.g., landslides in Rio’s favelas).

13. Evaluate Solutions

14. Smart Growth: Policies to limit sprawl (e.g., Portland’s urban growth boundary).
15. Public Transit: Subways (Tokyo), bus rapid transit (Bogotá’s TransMilenio).
16. Gentrification Alternatives: Inclusionary zoning (e.g., NYC’s 20% affordable housing requirement).

Common Mistakes

• Mistake: Assuming all cities follow the rank-size rule.

• Correction: Many countries (especially former colonies) have a primate city (e.g., Mexico City is 10x larger than Guadalajara). Why? Colonial powers concentrated development in one city.

• Mistake: Confusing gentrification with urban renewal.

• Correction: Gentrification displaces low-income residents; urban renewal (e.g., NYC’s 1950s slum clearance) often replaces them with public housing or highways.

• Mistake: Thinking suburbanization only happens in the U.S.

• Correction: It’s global! Example: São Paulo’s wealthy live in gated suburbs (e.g., Alphaville), while the poor live in favelas.

• Mistake: Ignoring informal economies in megacities.

• Correction: In Mumbai, 60% of jobs are informal (e.g., street vendors, rickshaw drivers). Why? Lack of formal employment opportunities.

• Mistake: Assuming all megacities are in MDCs.

• Correction: Most megacities are in LDCs (e.g., Lagos, Dhaka, Karachi). Why? Rapid rural-to-urban migration + high birth rates.

AP Exam Insights

1. FRQ Hot Topics:
2. Compare urban models (e.g., "Explain how the sector model applies to Mexico City").
3. Evaluate solutions to urban challenges (e.g., "Assess the effectiveness of public transit in reducing traffic congestion in megacities").

4. Analyze gentrification (e.g., "Describe two negative impacts of gentrification on low-income residents").

5. Multiple-Choice Traps:

6. "All megacities are world cities." False! Many megacities (e.g., Kinshasa, Lagos) have regional but not global influence.

7. "Urban sprawl only happens in MDCs." False! Sprawl occurs in LDCs too (e.g., Jakarta’s "extended metropolitan region").

8. Key Distinctions:

9. Megacity vs. World City: Size (10M+) vs. global influence (e.g., New York is both; Kinshasa is only a megacity).

10. Gentrification vs. Urban Renewal: Displacement vs. government-led redevelopment.

11. Data Interpretation:

12. Be ready to read population pyramids (e.g., a youth bulge in Lagos suggests future urban growth).
13. Map analysis: Identify primate cities or rank-size rule patterns.

Quick Check Questions

1. Which of the following best explains why many LDCs have primate cities? A) The rank-size rule is strictly followed. B) Colonial powers concentrated development in one city. C) Suburbanization has reduced urban populations. D) Megacities are only found in MDCs.

Answer: B. Explanation: Colonialism often led to uneven development, with one city (e.g., Lagos, Nairobi) dominating the economy.

1. A city planner proposes building a new subway line to reduce traffic congestion. This is an example of: A) Gentrification B) Smart growth C) Urban sprawl D) Informal housing

Answer: B. Explanation: Smart growth policies aim to limit sprawl and improve transit (e.g., Portland’s light rail).

1. Short FRQ: Describe two challenges faced by residents of squatter settlements in megacities and one solution to address them.
2. Challenge 1: Lack of clean water-disease (e.g., cholera in Mumbai’s slums).
3. Challenge 2: Vulnerability to disasters (e.g., landslides in Rio’s favelas).
4. Solution: Microfinance loans for housing upgrades or government-provided services (e.g., piped water in Kibera).

Last-Minute Cram Sheet

1. Megacity = 10M+ people (e.g., Tokyo, Delhi, Shanghai).
2. Metacity = 20M+ people (e.g., Tokyo, Jakarta).
3. Primate city = disproportionately largest city (e.g., Paris, Bangkok).
4. Rank-size rule: nth largest city = 1/n size of largest ( not all countries follow this!).
5. Central Place Theory: Cities spaced based on range and threshold.
6. Bid-rent theory: Land value decreases with distance from CBD.
7. Gentrification = wealthy move in-displaces poor (e.g., Brooklyn, Portland).
8. Squatter settlements = informal housing (e.g., favelas, slums).
9. New Urbanism = walkable, mixed-use neighborhoods (e.g., Celebration, FL).
10. Most megacities are in LDCs (e.g., Lagos, Dhaka, Karachi).