Intraregional Migration in AP Human Geography

Why a move across town still counts as population change

A common assumption is that only births, deaths, and international moves matter for population growth or decline. That holds only at the national scale. When a family leaves a rural county for a city an hour away, the country's total stays the same, but the rural county just lost residents and the city just gained them.

This is the scale shift Topic 2.4, Population Dynamics, in Unit 2: Population and Migration, asks you to handle. The course wants you to explain why populations rise and fall, and it names three forces that decide it: fertility, mortality, and migration. At the scale of a town, county, or city, intraregional migration can outweigh natural increase. A rural area with more births than deaths can still shrink if enough young people move out.

Rural-to-urban, city-to-suburb, and the reverse

The course pairs intraregional migration with three common patterns, each driven by push and pull factors working at a short distance.

• Rural-to-urban migration: people leave farming areas for nearby cities, pulled by factory and service jobs and pushed by limited land or farm mechanization. This is the main engine of urbanization in many developing countries.
• Urban-to-suburban migration (suburbanization): people leave central cities for surrounding suburbs, pulled by larger homes, more space, and schools. In the United States this pattern grew sharply after World War II as car ownership and highway building spread.
• Counterurbanization: people leave cities for small towns or rural areas, often for lower housing costs, quieter living, or the ability to work remotely.

Topic 2.4 also points out that social, cultural, political, and economic factors shape migration rates. In an answer, name the specific factor. "Better jobs" is weaker than "wage work in export factories pulled young adults out of farming villages."

Young movers reshape the age structure of both places

Migrants are disproportionately young adults, and that changes more than a headcount. The sending area keeps a larger share of older residents, so its crude birth rate tends to fall, its crude death rate tends to rise, and its dependency ratio goes up. Some rural areas end up with more deaths than births.

The receiving city gains people in their prime working and childbearing years. That boosts its labor force and can raise its local birth rate, adding growth on top of the migration itself. A strong Topic 2.4 explanation links the migration to these follow-on effects instead of stopping at "the city grew."

Intra vs. inter: classifying the move in a scenario

The mix-up that costs points is swapping intraregional with interregional migration. Intra means within, so the move stays inside one region (farm to nearby city, city to suburb). Inter means between, so the move crosses from one major region of a country to another, like the U.S. move from the Rust Belt to the Sun Belt. Both are internal migration, since nobody leaves the country. A move across a national border is international migration, which is a third category.

In multiple choice, expect a short scenario or a stimulus such as a map of county population change or a table of urban and rural percentages. You'll be asked to classify the move or explain its effect on population distribution. Check two things in the stem: whether a border was crossed, and how far the move went relative to the regions described.

On the free-response section, migration data fits naturally into Question 2 (One-stimulus question) or Question 3 (Two-stimuli question), where a map or data set could show rural decline next to urban growth. A top answer names the type of migration, gives a specific push or pull factor, and explains the effect at more than one scale. For example, the nation's total is unchanged while one county shrinks, ages, and loses tax base, and the nearby city expands.