Search results
Results From The WOW.Com Content Network
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).
A population history of the United States (Cambridge University Press, 2012) excerpt [permanent dead link ] Lahey, Joanna N. "Birthing a Nation: The Effect of Fertility Control Access on the Nineteenth-Century Demographic Transition," Journal of Economic History, 74 (June 2014), 482–508. Mintz Steven and Susan Kellogg.
An aging U.S. population presents real, but manageable, challenges—if we’re willing to act.
In 1831, president of Yale college Jeremiah Day included a United States population estimate as an example of an exponential equation.After stating that the 1820 population of the United States was 9,625,000, the projected 2020 population would be 2,464,000,000 (supposing it to double once every 25 years).
In the demographic transition model, the size and shape of population pyramids vary. In stage one of the demographic transition model, the pyramids have the most defined shape. They have the ideal big base and a skinny top. In stage two, the pyramid looks similar but starts to widen in the middle age groups.
The lengthy transition allowed fertility to decline at virtually the same rate that mortality also declined. Germany might be considered another example of this model. Accelerated model: (Japan) Japan experienced a rapid transition as a result of a few decades of intensive war-driven industrialization followed by postwar occupation. The ...
The theory states that these first settlers have significant impact on the social and cultural geography of the area, however few these first settlers may have been. They lay the groundwork for the following generations and are perhaps more important than the contributions of thousands of new immigrants generations later. [ 7 ]