period of time during the 1960s and 70s when fertility rates in the us dropped as large numbers of women from the baby boom generation sought higher levels of education and more competitive jobs, causing them to marry later in life.
rust belt
the northern industrial states of the us in which heavy industry was once the dominant economic activity .in the 1960s, 60s, and 80s, these states lost much of their economic base to economically attractive regions of the us and to countries where labor
Chain migration
The migration event in which individuals follow the migratory path of proceeding friends or family members to an existing cummunity
demographic accounting equation
an equation that summerizes the amount of growth or decline in a population within a country during a particular time period taking into account both natural increase and net migration
Cohort
A population group unified by specific common characteristic and subsequently treated as a statistical unit
Total fertility rate
the average number of children born to a woman during her child bearing years
refugees
people who leave their home because they are forced out, but not because they are being officially relocated or enslaved
doubling time
time period required for a population experiencing exponential growthto double in size completely
Carrying capacity
the largest number of people that the environment of a particular area can sustainably support.
exponential growth
growth that occurs when a fixed percentage of new people is added to the population each year. exponential growth is compound because the fixed growth rate applies to an ever increasing population
