AP Human Geography: Population Dynamics, Demographics, and Transition Models

Comprehensive vocabulary flashcards covering population density, demographic transition, Malthusian perspectives, population pyramids, and government population policies from AP Human Geography Unit 2A.

Arithmetic Density

The total number of people divided by the total land area, typically expressed as people per square kilometer or square mile.

Carrying Capacity

The maximum population size that an environment can sustain; areas around river deltas and valleys have high carrying capacities due to abundant water and arable land.

China's One-Child Policy (1980)

A national antinatalist policy implemented in 1980 that led to an unintended sex ratio imbalance resulting in significantly more men than women due to a cultural preference for male children.

Negative Rate of Natural Increase

A demographic condition occurring when a country's death rate exceeds its birth rate (such as Germany in the late 2010s with a birth rate of $9$ and a death rate of $11$ per $1{,}000$ population).

Demographic Transition Model: Stage 2

A stage of demographic growth characterized by high birth rates, rapidly falling death rates, high overall population growth, and high mortality from infectious and epidemic diseases (characteristic of regions such as West Africa).

Demographic Transition Model: Stage 4

A stage marked by low birth rates, low death rates, and a stable or declining population, where mortality is primarily driven by chronic conditions such as heart disease (characteristic of regions such as Western Europe).

Worldwide Mortality Decline

The global reduction in death rates and infant mortality rates over recent decades, driven primarily by improvements in hygiene, sanitation practices, healthcare access, and nutrition.

Demographic Momentum

The tendency of a growing population to continue growing after a fertility decline (such as Bangladesh reaching a total fertility rate of $2.1$) due to a large concentration of individuals in their youthful, childbearing years.

Pronatalist Policy

A government intervention designed to encourage higher birth rates in aging societies (such as Belgium or South Korea) by providing tax credits, subsidized childcare, parental leave, or cash allowances.

Youth Dependency Ratio

The proportion of young dependents (below age 15) relative to the working-age population, which remains exceptionally high in areas with total fertility rates exceeding $5.0$, such as sub-Saharan Africa.

Positive Checks

In Malthusian theory, natural events that increase the mortality rate (such as famine, starvation, disease, and war) when population demand outstrips the available food supply.

Malthusian Theory

The theory formulated by Thomas Malthus stating that population grows exponentially while food production grows arithmetically, predicting inevitable famine and starvation in less developed countries with high birth rates.

Neo-Malthusian Theory

An adapted demographic perspective asserting that population growth coupled with environmental degradation and geopolitical conflict precipitates catastrophe, such as twenty-first-century famines in South Sudan caused by war and drought.

Expansive Population Pyramid

An age-sex distribution with a wide base and narrow top (exemplified by Ghana in 2017), signifying high birth rates, a high total fertility rate, and a rapidly expanding youthful population.

Constrictive Population Pyramid

An age-sex distribution with a narrower base than middle (exemplified by Spain in 2017), signaling low fertility and an aging workforce that requires long-term planning for retirement and social security benefits.

Scale of Analysis

The geographic level at which population patterns are observed and mapped, ranging across varying administrative units such as census tracts, postal zip codes, and counties.

Female Educational Attainment and Fertility

An inverse correlation observed in countries like Canada and the United States, where increasing percentages of women attaining secondary or higher education directly correlate with declining total fertility rates.

Core Country Demographics

Demographic indicators typical of economically developed nations in 2018, characterized by low birth rates (around $10$ per $1{,}000$), below-replacement total fertility rates (around $1.6$), and higher proportions of women working in professional jobs.

Periphery Country Demographics

Demographic indicators typical of developing nations in 2018, characterized by high crude birth rates (around $33$ per $1{,}000$) and high total fertility rates (around $4.2$).

Aging Population Challenges

A demographic condition occurring in countries with high life expectancies and low birth rates (such as Japan), resulting in a shrinking workforce and requiring increased public funding to meet elderly healthcare needs.