In AP Human Geography, the death rate (crude death rate, or CDR) is the number of deaths per 1,000 people in a population per year. It pairs with the birth rate to determine the rate of natural increase and drives a country's movement through the Demographic Transition Model.
The death rate, usually measured as the crude death rate (CDR), counts how many people die per 1,000 people in a population in a year. "Crude" means it's a raw average for the whole population, with no adjustment for age or any other factor. That word matters more than it looks, because a country's age structure can make its crude death rate misleading. Japan, with excellent healthcare but lots of elderly people, can post a higher CDR than a much poorer country full of twenty-year-olds.
In the CED, death rates (mortality) are one of the three demographic factors that determine population growth or decline, alongside fertility and migration (EK IMP-2.A.1). Subtract the death rate from the birth rate and you get the rate of natural increase (RNI), the number geographers use to track whether a population is growing or shrinking on its own. Death rates are also the engine of the Demographic Transition Model. The big historical story of Stage 2 is that death rates fall first (thanks to sanitation, medicine, and food supply) while birth rates stay high, and that gap is what causes population explosions.
Death rates live in Unit 2: Population and Migration Patterns and Processes, and they show up in at least four topics. Learning objective 2.4.A asks you to explain population growth and decline using fertility, mortality, and migration, and to work with RNI and doubling time. Learning objective 2.5.A covers the Demographic Transition Model and the epidemiological transition, which exists specifically to explain why death rates change (from famines and infectious disease in early stages to chronic, degenerative diseases like heart disease in later stages). Learning objective 2.9.A connects death rates and life expectancy to aging populations and the dependency ratio. If you can read a death rate and say what it implies about a country's DTM stage, age structure, and likely policy problems, you've covered a huge chunk of Unit 2 in one move.
Keep studying AP Human Geography Unit 2
Demographic Transition Model (Unit 2)
The DTM is basically the story of death rates falling before birth rates do. Stage 2 begins when sanitation and medicine cut the death rate while births stay high, which is exactly why Stage 2 countries grow so fast.
Epidemiological Transition (Unit 2)
The DTM tells you death rates fall; the epidemiological transition tells you why. It tracks the shift in what kills people, from pandemics and infectious disease early on to chronic conditions like heart disease and cancer in developed countries.
Rate of Natural Increase (Unit 2)
RNI is just birth rate minus death rate. A 2017 FRQ and the 2023 set-based questions both used RNI maps, so being able to plug death rates into that equation is a directly tested skill.
Aging Populations (Unit 2)
Here's the twist. As a country ages, its crude death rate can creep back up even though healthcare keeps improving, simply because elderly people die at higher rates. A rising CDR in a Stage 4 or 5 country signals aging, not crisis.
Multiple-choice questions love to give you a country profile (declining death rates, high birth rates, rapid industrialization) and ask you to place it in a DTM stage or explain the change using the epidemiological transition. Fiveable practice questions hit exactly this pattern, including one asking which economic factor explains falling death rates with still-high birth rates (that's Stage 2). On free-response questions, death rates usually show up inside the rate of natural increase. The 2017 FRQ presented a map of natural increase rates, and a 2023 short-answer set defined RNI as the tool geographers use to assess annual growth or decline. Expect to do three things with this term: calculate or interpret RNI from birth and death rates, explain why death rates fall (medicine, sanitation, food supply) using the epidemiological transition, and explain why crude death rates can rise again in aging societies.
The crude death rate averages deaths across an entire population, while an age-specific death rate measures deaths within one age group (like deaths per 1,000 people aged 65+). This is why crude rates can deceive you. Germany's CDR is higher than Mexico's, not because Germans are less healthy, but because Germany's population is much older. Age-specific rates strip out that distortion.
The crude death rate (CDR) measures deaths per 1,000 people per year, and 'crude' means it ignores age structure entirely.
Birth rate minus death rate equals the rate of natural increase (RNI), the core formula for population growth questions in Unit 2.
In the Demographic Transition Model, death rates fall in Stage 2 (before birth rates do), and that gap causes rapid population growth.
The epidemiological transition explains changing death rates by tracking the shift from infectious diseases to chronic, degenerative diseases as countries develop.
Wealthy countries with aging populations can have higher crude death rates than poorer countries with young populations, so always check age structure before judging a CDR.
Mortality is one of three demographic factors, along with fertility and migration, that determine whether a population grows or declines (EK IMP-2.A.1).
It's the crude death rate (CDR), the number of deaths per 1,000 people in a population per year. It combines with the birth rate to determine the rate of natural increase and is a key indicator of a country's stage in the Demographic Transition Model.
No. Aging Stage 4 and 5 countries like Japan and Germany often have higher crude death rates than younger developing countries, because elderly populations naturally have more deaths per 1,000 people. A high CDR can signal an old population, not a failing one.
On the AP exam they're essentially the same thing, with mortality being the formal CED word for the death side of population change. The distinction that actually matters is crude death rate (whole population) versus age-specific death rates (one age group at a time).
Industrialization brings better sanitation, medicine, vaccines, and food supply, which slashes deaths from infectious disease. Birth rates stay high for a generation or more, so the population booms. The epidemiological transition is the CED concept that explains this shift in causes of death.
Subtract the death rate from the birth rate (both per 1,000), then convert to a percentage by dividing by 10. So a birth rate of 30 and a death rate of 10 gives an RNI of 20 per 1,000, or 2% growth per year. Note that RNI ignores migration entirely.