Why do people leave one place and move to another, and what shapes the routes they take?
Topic 2.10 Causes of Migration: explain the push and pull factors, intervening obstacles and opportunities, and the laws and theories that account for why and how people migrate.
A focused answer to AP Human Geography Topic 2.10, covering push and pull factors, intervening obstacles and opportunities, Ravenstein's laws of migration, the gravity model, and how these forces shape migration flows across scales.
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What this topic is asking
Topic 2.10 opens the migration half of Unit 2 by asking why people move. The College Board wants you to explain the push and pull factors that drive migration, the intervening obstacles and opportunities that shape the route and destination, and the classic laws and theories of migration, especially Ravenstein's laws and the gravity model. This is a cause-focused topic: the exam rewards students who can sort the forces acting on a migrant at the origin, along the way, and at the destination.
Push and pull factors
The core framework for explaining migration is the push-pull model.
Push and pull factors come in recognizable categories the exam likes you to use:
- Economic. Unemployment and low wages push; jobs and higher pay pull. This is the most common driver of voluntary migration.
- Political. War, persecution, and oppression push; safety and freedom pull.
- Environmental. Drought, flooding, and disaster push; favorable climate and resources pull.
- Social and cultural. Discrimination pushes; family reunification and community pull.
Most migration results from push and pull acting together: a worker leaves a region of unemployment (push) for a city of jobs (pull).
Intervening obstacles and opportunities
Migration is rarely a straight line from origin to destination; what lies between matters.
These concepts connect to the spatial ideas of Topic 1.4: the friction of distance makes nearer destinations cheaper, which is why intervening opportunities so often divert migrants.
Laws and theories of migration
Two classic frameworks summarize migration patterns.
Ravenstein's laws of migration (a set of nineteenth-century observations) describe regularities still broadly true today, including that:
- Most migrants travel short distances.
- Those who migrate long distances tend to head for major centers of economic opportunity.
- Migration occurs in steps and produces counter-streams (some people move back).
- The main cause of migration is economic.
The gravity model formalises one of these ideas: the predicted migration (or interaction) between two places is directly proportional to their populations and inversely proportional to the distance between them. Larger places attract more migrants, and nearer places attract more than distant ones, an application of distance decay.
Why this matters for the exam
Causes of migration set up the next two topics, forced versus voluntary migration (2.11) and the effects of migration (2.12), and connect back to the spatial concepts of Unit 1. FRQs commonly ask you to classify factors, distinguish obstacles from opportunities, or apply Ravenstein or the gravity model, so practice sorting the forces by where they act.
Try this
Q1. Identify whether persecution at a migrant's home is a push or a pull factor, and define the other type. [Recall]
- Cue. Persecution is a push factor (a negative condition at the origin). A pull factor is a positive condition at the destination, such as safety or jobs, that attracts the migrant.
Q2. Explain how an intervening opportunity could change where a migrant settles. [Short explanation]
- Cue. If a migrant heading to a distant city finds a nearer place offering the same job or safety, the closer option (an intervening opportunity) diverts them to settle there instead, at lower cost.
Exam-style practice questions
Practice questions written in the style of College Board exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
AP 2018 (style)1 marksA mountain range that slows or stops migrants on their journey between an origin and a destination is best described as: (A) a pull factor. (B) an intervening obstacle. (C) an intervening opportunity. (D) a push factor.Show worked answer →
A stimulus-style multiple choice item. The correct answer is (B).
An intervening obstacle is a physical or political barrier that hinders migration between origin and destination, such as a mountain range, a desert, an ocean, or a border. A pull factor (A) attracts migrants to a destination; an intervening opportunity (C) is a closer alternative that diverts them; a push factor (D) drives them from the origin.
The exam reward is distinguishing obstacles (barriers en route) from push and pull factors (conditions at origin and destination) and from intervening opportunities (closer alternatives).
AP 2021 (style)3 marksMigration results from forces at the origin and destination. (A) Describe the difference between a push factor and a pull factor. (B) Explain how an intervening opportunity can change the destination of a migrant. (C) Explain ONE of Ravenstein's observations about the distance most migrants travel.Show worked answer →
A 3-point describe-explain FRQ.
(A) Describe (1 point): a push factor is a negative condition at the origin that drives people to leave (war, unemployment, drought); a pull factor is a positive condition at the destination that attracts them (jobs, safety, family).
(B) Explain (1 point): an intervening opportunity is a more attractive or closer option encountered along the way, so a migrant heading to a distant city may stop and settle at a nearer place that meets the same need (a job or safety), changing the destination.
(C) Explain (1 point): Ravenstein observed that most migrants travel short distances, and those who go far tend to head for major centers of economic opportunity; long-distance migration is the exception, not the rule.
Markers reward a clear push-pull contrast, a correct account of intervening opportunity, and an accurate Ravenstein observation.
Related dot points
- Topic 2.11 Forced and Voluntary Migration: distinguish forced from voluntary migration and identify their major types, including refugees, internally displaced persons, asylum seekers, and transnational and internal migration.
A focused answer to AP Human Geography Topic 2.11, distinguishing forced migration (refugees, internally displaced persons, asylum seekers, historical slavery) from voluntary migration (transnational, internal, step, chain, and transhumance) with clear definitions and examples.
- Topic 2.12 Effects of Migration: explain the economic, cultural, political, and demographic effects of migration on origin and destination places.
A focused answer to AP Human Geography Topic 2.12, explaining the economic, demographic, cultural, and political effects of migration on both origin (sending) and destination (receiving) places, including remittances, brain drain, and changes to age structure.
- Topic 1.4 Spatial Concepts: define and apply the spatial concepts of location, place, distance, pattern, and the processes of distance decay, time-space compression, and flows.
A focused answer to AP Human Geography Topic 1.4, covering the core spatial vocabulary: absolute and relative location, place, distribution and pattern, distance decay, the friction of distance, time-space compression, and spatial flows.
- Topic 2.1 Population Distribution: describe the factors that influence where people live and the methods used to measure population density and distribution.
A focused answer to AP Human Geography Topic 2.1, covering the physical and human factors that shape where people live, the three measures of population density (arithmetic, physiological, agricultural), the ecumene, and how to read distribution patterns.
- Topic 2.9 Aging Populations: explain the causes of population aging and the economic, social, and political challenges and responses it brings.
A focused answer to AP Human Geography Topic 2.9, explaining why populations age, the rising old-age dependency ratio, the economic and social challenges of an aging society, and the policy responses including immigration and pronatalism.
Sources & how we know this
- AP Human Geography Course and Exam Description — College Board (2020)