AP Human Geography Review Guide: All 7 Units Explained

AP Human Geography is one of the shortest AP exams and one of the most predictable. The course is built around a small set of models (demographic transition, von Thunen, concentric zone, Weber, world systems) that show up on every exam. If you know the models plus a few case studies per theme, the exam is very manageable.

This guide walks you through all 7 units, the 8+ models you must memorize, and the FRQ templates that score well. Learn the models, use the vocabulary, and apply them to specific places.

What the exam looks like

Exam structure and scoring

• 2 hours 15 minutes total.
• Section I: 60 multiple choice in 60 minutes. Worth 50 percent.
• Section II: 3 free response in 75 minutes. Worth 50 percent.
• FRQ #1: no stimulus. Apply concepts to a scenario.
• FRQ #2: stimulus (map, chart, image). Interpret and analyze.
• FRQ #3: two stimuli. Compare and analyze.
• Each FRQ has 7 parts (A-G), increasing in complexity. Early parts are definitions; later parts require application.
• No calculator. Specific geographic vocabulary is essential.

Unit 1: Thinking Geographically

What you need to know (8-10 percent)

• Maps and projections: Mercator (preserves angles, distorts size near poles), Peters (preserves area, distorts shape), Robinson (compromise), Goode's homolosine (preserves area via interruptions), Fuller/Dymaxion.
• Types of maps: reference (political, physical) vs thematic (dot density, choropleth, graduated/proportional symbols, isoline, cartogram).
• Scale of analysis: global, regional, national, local. Scale matters: poverty rate at national scale hides huge regional variations.
• Absolute vs relative location: absolute = latitude/longitude. Relative = in relation to other places.
• Types of regions: formal (uniform, e.g., Corn Belt, countries with common official language), functional (nodal, organized around a central point like a media market), vernacular (perceived, e.g., 'The Bible Belt', 'Silicon Valley').
• GIS (Geographic Information Systems): digital mapping that layers data. Used in urban planning, disaster response.
• Spatial patterns: absolute distance (miles), relative distance (travel time), time-space compression (technology reduces effective distance).
• Geographic data sources: census, remote sensing (satellites), field work, GPS.

Unit 2: Population and Migration

What you need to know (12-17 percent)

Population

• Demographic Transition Model (DTM) - 5 stages: Stage 1 (high birth/death, low growth, pre-industrial). Stage 2 (death drops, birth still high, rapid growth). Stage 3 (birth drops, growth slows). Stage 4 (both low, slow growth). Stage 5 (birth below death, shrinking population).
• Stage examples: Stage 2 (parts of sub-Saharan Africa), Stage 3 (Mexico, India moving toward). Stage 4 (US, most of Europe). Stage 5 (Japan, Germany, Italy).
• Total Fertility Rate (TFR): average births per woman. Replacement rate is ~2.1. Below 2.1 = shrinking.
• Crude Birth/Death Rate (CBR, CDR): births/deaths per 1000 people per year.
• Natural Increase Rate (NIR) = (CBR - CDR) / 10. If NIR = 1, population doubles in 70 years (rule of 70).
• Population pyramids: show age/sex structure. Broad base = young, growing. Even = stable. Narrow base = aging, shrinking.
• Dependency ratio: young (0-15) + old (65+) divided by working age (15-64). High = more dependents per worker.
• Malthus vs Boserup: Malthus predicted population would outgrow food; Boserup argued population drives innovation.
• Epidemiological transition: disease patterns shift (infectious -> chronic) as countries develop.

Migration

• Push factors (drive people away): war, famine, persecution, unemployment, environmental disaster.
• Pull factors (attract people): jobs, education, family, political/religious freedom, climate.
• Ravenstein's laws: most migrants move short distances, women migrate locally more than men, most are young adults, economic factors drive migration.
• Types: voluntary vs forced (refugees, human trafficking, slavery). Internal (rural-to-urban) vs international. Step migration (in stages, e.g., village -> small town -> large city).
• Remittances: money migrants send home. Major economic flow to many developing countries.
• Brain drain: emigration of highly educated workers (doctors leaving developing countries for developed ones).
• Chain migration: relatives follow earlier migrants to established communities.
• Refugees vs IDPs (internally displaced persons): refugees cross borders, IDPs remain in own country.

Unit 3: Cultural Patterns and Processes

What you need to know (12-17 percent)

• Folk (traditional, localized) vs popular (widespread, mass-produced) culture.
• Cultural hearth: where a cultural innovation originated.
• Language families: Indo-European largest (English, Spanish, Hindi, Russian). Sino-Tibetan (Mandarin), Afro-Asiatic (Arabic), Niger-Congo.
• Lingua franca: language used between people who don't share native language (English globally). Pidgin (simplified, for trade) vs Creole (pidgin becomes first language).
• Religions: universalizing (seek converts: Christianity, Islam, Buddhism) vs ethnic (tied to a people/place: Hinduism, Judaism, Sikhism). Branches, denominations, sects within.
• Cultural diffusion types: relocation (moves with migrants), expansion (spreads while staying in origin): contagious (like a disease, neighbors), hierarchical (spreads along power/size hierarchy), stimulus (general idea spreads, adapts locally), reverse hierarchical (from small to big, unusual).
• Example: McDonald's expanding globally = hierarchical expansion diffusion. A virus through a crowd = contagious expansion diffusion. An immigrant bringing their cuisine = relocation diffusion.
• Cultural convergence (cultures merge, homogenization) vs divergence (cultures differentiate).
• Globalization's effect on culture: Americanization, McDonaldization, but also hybrid cultures.

Unit 4: Political Patterns and Processes

What you need to know (12-17 percent)

• State (country with sovereignty), nation (group with shared identity), nation-state (nation with its own state, Japan close, Iceland nearly perfect), multinational state (multiple nations within, UK, Canada), stateless nation (no state of their own, Kurds, Palestinians, historically Jews before Israel).
• Devolution: central government gives power to sub-national units. Scotland from UK, Quebec debates in Canada, Basque region in Spain.
• Supranational organizations: UN, EU, NATO, ASEAN, WTO, African Union.
• Boundary types: antecedent (drawn before settlement, Indonesia/Papua New Guinea), subsequent (after settlement, adjusts to cultural features), superimposed (imposed without regard for culture, colonial Africa), relic (no longer functions, Berlin Wall, Great Wall of China).
• Boundary disputes: definitional (wording), locational (where exactly), operational (how to manage), allocational (resources under boundary like oil).
• Centripetal forces (unify state): shared language, religion, history, external threats, strong leader.
• Centrifugal forces (divide state): ethnic conflict, economic inequality, corruption.
• Gerrymandering: drawing voting districts to favor a party. Packing (concentrating opposition in one district) vs cracking (spreading them thin).
• Forms of government: unitary (power centralized, France) vs federal (power shared with states, US, Germany).
• Colonialism vs imperialism: colonialism = direct control and settlement. Imperialism = broader political/economic dominance.

Unit 5: Agriculture and Rural Land Use

What you need to know (12-17 percent)

• Three Agricultural Revolutions: First / Neolithic (domestication of plants and animals, ~10,000 years ago, hearths in Fertile Crescent, Mesoamerica, China). Second (scientific methods, crop rotation, machinery, 1700s Britain). Third / Green Revolution (hybrid seeds, fertilizers, pesticides, mechanization, 20th century, India, Mexico).
• Subsistence agriculture (grow what you eat) vs commercial (grow to sell). Common in developing vs developed.
• Types: shifting cultivation (slash and burn), pastoral nomadism (herding in dry regions), intensive (high input per area: rice in East Asia, Mediterranean), extensive (low input: ranching, wheat in US plains), plantation (commercial, tropical, cash crops).
• Von Thunen's Model: assumes isolated city, flat land, uniform climate. Rings radiating from city: dairy/horticulture (closest, perishable), forest, grains, ranching (furthest).
• Clustered vs dispersed settlements: depend on topography, culture.
• Survey patterns: metes and bounds (natural features, oldest US), township-and-range (grid, Midwest/West), long lot (narrow river frontage, French Louisiana and Quebec).
• GMOs: genetically modified organisms. Controversial for environmental and health reasons.
• Food deserts: areas (often urban low-income or rural) without access to fresh food.
• Modern trends: organic farming, urban agriculture, fair trade, local food movements.

Unit 6: Cities and Urban Land Use

What you need to know (12-17 percent)

• Central Place Theory (Christaller): settlements form hierarchy based on goods/services they provide. Range (distance people will travel for a good) vs threshold (minimum demand needed to sustain).
• Rank-size rule: nth largest city is 1/n the size of largest (US approximately follows).
• Primate city: largest city dwarfs others (Paris, Mexico City, Bangkok).
• World cities (global cities): command and control for global economy. New York, London, Tokyo are top tier.
• Suburbanization, edge cities (commercial hubs outside central city).
• Urban models for North America: Concentric Zone (Burgess, Chicago 1920s): rings of CBD, transition zone (slums), workers, middle-class, commuter. Sector (Hoyt): wedges radiating from CBD along transit. Multiple Nuclei (Harris-Ullman): multiple commercial centers.
• Griffin-Ford (Latin American city): CBD with wealthy spine, concentric rings decreasing in wealth, disamenity sector (favelas).
• Sub-Saharan African city: three CBDs (traditional, colonial, market), ethnic neighborhoods, squatter settlements.
• Southeast Asian city (McGee): focal point is port, not CBD. Mixed land use.
• Urban issues: gentrification (wealth displaces poor from revitalized neighborhoods), urban sprawl (low-density expansion), brownfields (abandoned industrial), smart growth, new urbanism.
• Census tract vs MSA (metropolitan statistical area).

Unit 7: Industrial and Economic Development

What you need to know (12-17 percent)

• Industrial Revolution: started in Britain (1700s). Steam power, textiles, railroads. Spread to Western Europe, US, Japan, East Asia.
• Weber's Least Cost Theory: factory locates to minimize combined cost of raw materials, labor, transportation. Weight-gaining industries (bakeries) locate near market. Weight-losing (smelters) locate near raw materials.
• Rostow's Stages of Economic Development: Traditional society, Preconditions for takeoff, Takeoff, Drive to maturity, Age of high mass consumption. Linear model, critiqued for Western bias.
• Wallerstein's World Systems Theory: Core (rich, industrial: US, Germany, Japan), Semi-periphery (transitional: China, Brazil, India), Periphery (poor, raw material producers: sub-Saharan Africa, Bangladesh). Core exploits periphery; semi-periphery buffers.
• Measures of development: GDP/GNI (economic output), GDP per capita (per person), HDI (Human Development Index: life expectancy, education, income), GII (Gender Inequality Index).
• Measures of social welfare: literacy rate, infant mortality, maternal mortality, life expectancy.
• Economic sectors: primary (extraction: farming, mining), secondary (manufacturing), tertiary (services), quaternary (research, tech, info), quinary (high-level decisions, CEOs).
• Shift from primary to tertiary indicates development (deindustrialization in developed countries).
• Fordism (assembly line, mass production) vs post-Fordism (flexible production, customization, global supply chains).
• Globalization: interconnected economies. Supply chains span countries. Outsourcing to lower-wage nations.
• MNCs (multinational corporations): operate across multiple countries.
• Fair trade, microfinance, sustainable development: responses to development inequality.

The models you must memorize

• Demographic Transition Model (5 stages: birth/death rates).
• Ravenstein's laws of migration.
• Von Thunen's agricultural land use model.
• Concentric Zone (Burgess), Sector (Hoyt), Multiple Nuclei (Harris-Ullman) urban models.
• Griffin-Ford (Latin American), Sub-Saharan African, McGee (Southeast Asian) city models.
• Weber's Least Cost Theory (industrial location).
• Rostow's Stages of Economic Development.
• Wallerstein's World Systems Theory (core/semi-periphery/periphery).
• Central Place Theory (Christaller): settlement hierarchy.

How to score a 5 on AP Human Geography

1. Memorize the models. Each one is likely to appear on the exam. Know the stages, rings, sectors cold.
2. Learn vocabulary. APHG graders reward specific geographic terminology (centripetal forces, centrifugal forces, gerrymandering, chain migration). Substitute these for general terms.
3. Know case studies for each theme. Population: Japan (Stage 5, aging). Culture: Hindi/Urdu divergence. Politics: EU devolution. Agriculture: Green Revolution in India.
4. Practice the FRQ format. 7 parts (A-G). Parts A-B are usually definitions. Parts C-G require application. Answer ALL parts.
5. On stimulus FRQs, reference the stimulus explicitly ('as the map shows' or 'the graph indicates'). Graders reward this.
6. Use the define-then-apply template like on AP Psych. State the concept, then apply it to the scenario.

Common mistakes

• Confusing migration terms. EMIGRATE is LEAVING. IMMIGRATE is ARRIVING. Remember E = Exit.
• Applying the wrong urban model to the wrong region. Do not apply Burgess to Latin America. Match the model to the region.
• Using 'race' and 'ethnicity' interchangeably. They are NOT the same. Race is about biological classification (often socially constructed); ethnicity is about cultural identity.
• Forgetting to use geographic terminology on FRQs. 'People move' does not earn points. 'Rural-to-urban migration driven by pull factors of industrial employment' does.
• Confusing contagious (disease-like spread among neighbors) and hierarchical (spreads along power/size hierarchy) diffusion.
• Treating all countries in one stage of DTM as identical. Within-stage variation is significant.
• Calling nation and state the same thing. Nation = people with shared identity. State = country with sovereignty. Nation-state = nation with its own state.
• Using development measures without defining them. Do not just say 'HDI is high.' Say 'Human Development Index, measuring life expectancy, education, and income, is high.'

Learn the models, use the vocabulary, apply them to specific places. That is APHG in one sentence.