20th Century Demography

20th-century demography is the study of population changes and trends during that period. It examines how factors like birth rates, death rates, migration, and life expectancy influenced global and regional populations. Key developments include rapid population growth in many countries, urbanization, and shifts caused by technology, medicine, and social changes. It helps us understand patterns such as aging populations in some regions and youth bulges in others, as well as the impact of events like wars, pandemics, and policies on population dynamics. Overall, it provides insights into how human populations have evolved and shaped societies over the 20th century.