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In demography, demographic transition is a phenomenon and theory in the social sciences referring to the historical shift from high birth rates and high death rates to low birth rates and low death rates as societies attain more technology, education (especially of women), and economic development. [1]
The Zelinsky Model of Migration Transition, [1] also known as the Migration Transition Model or Zelinsky's Migration Transition Model, claims that the type of migration that occurs within a country depends on its development level and its society type. It connects migration to the stages within the Demographic Transition Model (DTM).
Wilbur Zelinsky (21 December 1921 [1] – 4 May 2013 [2]) was an American cultural geographer. [3] He was most recently a professor emeritus at Pennsylvania State University . He also created the Zelinsky Model of Demographic Transition .
The United States is a country primarily located in North America. Demographics of the United States concern matters of population density , ethnicity , education level, health of the populace , economic status, religious affiliations, and other aspects regarding the population.
For example, the chart below shows that the UN Population Division assumes that the total fertility rate (TFR), which has been steadily declining since 1963, will continue to decline, at varying paces depending on circumstances in individual regions, to a below-replacement level of 1.8 by 2100.
Demographic economics or population economics is the application of economic analysis to demography, the study of human populations, including size, growth, density, distribution, and vital statistics.