AP Human Geography Unit 2 Population and Migration Patterns and Processes

Physical Factors

Natural features such as climate, landforms, and water that influence where people live. Physical factors determine habitability, resource availability, and agricultural potential. Areas with favorable physical conditions tend to have higher population densities. Harsh environments often limit settlement.

Human Factors

Cultural, economic, historical, and political influences that shape where people live. These factors determine opportunities, safety, and quality of life. Human factors can attract or repel populations. They interact with physical factors to shape settlement patterns.

Population Density

The number of people living in a given area. It reflects how crowded or sparse a region is. Density affects resource use, infrastructure, and quality of life. It helps geographers understand settlement patterns.

Population Distribution

The pattern of where people live across Earth’s surface. It is influenced by physical and human factors. Distribution can be clustered, dispersed, or linear. It helps explain global and regional population trends.

Carrying Capacity

The maximum population an environment can sustainably support. It depends on resources, technology, and land use. Exceeding carrying capacity leads to environmental strain. It helps predict population pressures.

Population Pyramids

Graphs showing the age and sex structure of a population. They reveal growth trends, economic needs, and social challenges. Different shapes indicate different stages of development. Population pyramids help predict future demographic changes.

Curved Expanding

A population pyramid shape showing rapid growth with a wide base and slightly curved sides. It indicates high birth rates and improving health conditions. This pattern is common in developing countries. It suggests a young population.

Expanding

A pyramid with a very wide base and narrow top, showing high birth rates and high death rates. It indicates rapid population growth. This shape is typical of less developed countries. It suggests a youthful population with high dependency.

Stationary

A pyramid with straight sides and a fairly even distribution across age groups. It indicates low birth and death rates. This shape is common in developed countries. It suggests stable population growth.

Contracting

A pyramid with a narrow base and wider upper ages. It indicates low birth rates and an aging population. This shape is common in highly developed countries. It suggests population decline.

Fertility

The number of children born to women in a population. Fertility rates influence population growth and age structure. High fertility leads to rapid growth, while low fertility leads to aging populations. Fertility is shaped by culture, economics, and policy.

Mortality

The rate at which people die in a population. Mortality reflects health care, living conditions, and disease. High mortality reduces population growth. Mortality trends help identify development levels.

Migration

The movement of people from one place to another. Migration affects population size, distribution, and cultural patterns. It can be voluntary or forced. Migration shapes demographic change.

Rate of Natural Increase

The difference between birth rates and death rates. It shows how fast a population is growing without migration. High RNI indicates rapid growth. Low or negative RNI indicates slow growth or decline.

Population-Doubling Time

The number of years it takes for a population to double in size. It depends on the rate of natural increase. Fast-growing populations have short doubling times. It helps predict future population pressures.

Stage 1 (DTM)

A stage with high birth and death rates and very slow population growth. Societies rely on subsistence farming and lack modern medicine. Few countries remain in this stage today. It represents pre-industrial populations.

Stage 2 (DTM)

A stage with high birth rates and rapidly falling death rates. Population grows quickly due to improved sanitation and medicine. Many developing countries have experienced this stage. It leads to rapid demographic expansion.

Stage 3 (DTM)

A stage where birth rates begin to fall while death rates remain low. Population growth slows as societies industrialize. Families choose to have fewer children. This stage reflects improving economic conditions.

Stage 4 (DTM)

A stage with low birth and death rates and stable population growth. It is common in developed countries. High life expectancy and strong economies define this stage. It leads to aging populations.

Stage 5 (DTM)

A stage where birth rates fall below death rates, causing population decline. Countries in this stage face labor shortages and aging populations. Immigration often becomes necessary to maintain workforce levels. It reflects advanced development.

Stage 1 (ETM)

A stage dominated by infectious diseases, famine, and poor sanitation. Mortality is high and life expectancy is low. This stage corresponds to pre-industrial societies. Disease outbreaks are common.

Stage 2 (ETM)

A stage where pandemics decline due to improved sanitation and medicine. Death rates fall rapidly. Life expectancy increases. This stage aligns with early industrialization.

Stage 3 (ETM)

A stage where chronic diseases like heart disease and cancer become leading causes of death. Life expectancy continues to rise. Improved health care reduces infectious disease. This stage reflects industrial societies.

Stage 4 (ETM)

A stage with delayed degenerative diseases due to medical advances. People live longer with chronic conditions. Lifestyle-related illnesses become more common. This stage reflects advanced development.

Stage 5 (ETM)

A stage where new infectious diseases re-emerge or evolve. Antibiotic resistance and global travel increase risks. Mortality may rise slightly. This stage reflects modern health challenges.

Critiques to Neo Malthusian Theory

Critics argue that technology, innovation, and improved agriculture prevent the food shortages predicted by Malthusians. They believe human creativity expands resource availability. Critics also note that population growth is slowing globally. They argue scarcity is often political, not natural.

Neo Malthusians

People who believe population growth will outpace resources, leading to conflict and environmental collapse. They argue that rapid growth strains food, water, and energy supplies. Neo Malthusians support population control policies. Their ideas influence environmental debates.

Pronatalist Policies

Government policies that encourage people to have more children. They include financial incentives, childcare support, and parental leave. These policies address aging populations and labor shortages. Countries like France and Japan use pronatalist strategies.

Anti-natalist Policies

Government policies that discourage high birth rates. They include family planning, education, and access to contraception. These policies aim to slow population growth. Countries like China and India have used anti-natalist measures.

Pro Immigration Policies

Policies that encourage immigration to increase population or fill labor shortages. They may offer visas, work programs, or pathways to citizenship. These policies support economic growth. They help address aging populations.

Anti-Immigration Policies

Policies that restrict immigration to protect jobs, culture, or security. They may include quotas, border controls, or strict visa rules. These policies reduce population growth from migration. They reflect political and cultural concerns.

Critiques to Ravenstein's Laws of Migration

Critics argue that modern migration is more complex than Ravenstein described. Globalization, technology, and policy changes influence migration today. Long-distance migration is more common. His laws remain useful but incomplete.

Fecundity

The biological ability to reproduce. Fecundity varies by age, health, and genetics. It influences fertility rates. It helps explain demographic patterns.

Life Expectancy

The average number of years a person is expected to live. It reflects health care, nutrition, and living conditions. High life expectancy indicates development. It shapes population age structure.

Aging Population

A population with a growing percentage of older adults. It results from low birth rates and high life expectancy. Aging populations strain healthcare and pension systems. They require immigration or policy changes to maintain workforce levels.

Dependency Ratio

The ratio of dependents (young and old) to the working-age population. High dependency ratios strain economies. They indicate the need for social support systems. Dependency ratios help predict economic challenges.

Elderly Dependency Ratio

The number of older dependents compared to working-age adults. High ratios indicate aging populations. They increase demand for healthcare and pensions. They challenge economic sustainability.

Youth Dependency Ratio

The number of young dependents compared to working-age adults. High ratios indicate youthful populations. They require investment in education and childcare. They shape future workforce needs.

Push Factors

Conditions that force people to leave their homes, such as conflict, poverty, or environmental disasters. Push factors create migration pressure. They influence global population movement. They often lead to forced migration.

Intervening Obstacles

Barriers that prevent or slow migration, such as laws, borders, or financial limitations. They restrict movement even when push or pull factors exist. Obstacles can be political or environmental. They shape migration patterns.

Pull Factors

Conditions that attract people to a new location, such as jobs, safety, or better living conditions. Pull factors encourage voluntary migration. They shape population distribution. They influence global migration flows.

Intervening Opportunities

Unexpected opportunities that cause migrants to settle before reaching their original destination. These opportunities may include jobs, safety, or family connections. They alter migration paths. They help explain settlement patterns.

Forced Migration

Migration in which people are compelled to move due to conflict, disaster, or persecution. It often results in refugees or displaced persons. Forced migration disrupts communities. It creates humanitarian challenges.

Slavery

A form of forced migration in which people were taken and transported against their will. The transatlantic slave trade moved millions of Africans to the Americas. Slavery reshaped cultures, economies, and populations. Its effects remain visible today.

Refugees

People who flee their country due to persecution, conflict, or disaster. They receive international protection. Refugees face major challenges in safety and resettlement. They shape global migration patterns.

Internally Displaces Persons

People who flee their homes but remain within their country. They often escape conflict or disaster. IDPs lack the protections given to refugees. They represent major humanitarian concerns.

Asylum Seekers

People who migrate seeking protection from danger in their home country. They apply for legal refugee status. Asylum seekers face long legal processes. They highlight global political and humanitarian issues.

Voluntary Migration

Migration by choice, often for economic or social reasons. It reflects personal decisions and opportunities. Voluntary migration shapes cultural and economic landscapes. It is a major driver of population change.

Transnational Migration

Migration in which people maintain connections across multiple countries. Migrants send remittances and maintain cultural ties. Transnationalism creates global networks. It influences both origin and destination countries.

Transhumance

Seasonal movement of livestock herders between pastures. It is a form of cyclical migration. Transhumance reflects traditional agricultural practices. It shapes cultural landscapes.

Internal Migration

Movement within a country’s borders. It includes rural-to-urban migration and regional shifts. Internal migration affects population distribution. It shapes economic and social patterns.

Chain Migration

Migration in which people follow family or community members to a new location. It strengthens cultural ties and creates ethnic enclaves. Chain migration reduces migration risks. It shapes settlement patterns.

Step Migration

Migration that occurs in stages, such as moving from a village to a town and then to a city. Each step brings new opportunities. Step migration reflects economic and social mobility. It explains gradual movement patterns.

Guest Worker

A migrant who moves temporarily for work, often through government programs. Guest workers fill labor shortages. They contribute to economies but may face limited rights. They shape international labor flows.

Rural-to-Urban Migration

Movement from countryside to cities in search of jobs and opportunities. It drives urbanization. Rural-to-urban migration reshapes economies and landscapes. It is common in developing countries.