Population Pyramids
Oakland's population pyramid is in a stationary pyramid, where there is a somewhat equal proportion of people in the age groups.
Chicago's population pyramid is in a constrictive state, because it is showing a decline in birth rates and each new generation is decreasing in size.
Detroit's population pyramid is in a stationary position, all of the age groups have somewhat the same amount of people in them.
Boston's population is heading towards a constrictive and declining state because, there is a small number of newborns compared to the people in their 20's.
Philadelphia's population is in a somewhat stable position because all of the age groups have similar proportions of population.
Compton's population is increasing rapidly because there are many more young people in the city than elderly.