There are many potential uses of understanding how the population might change into the future. Population projections help us to plan and prepare for likely demographic changes. Using the current population structure and applying birth, death, and net migration rates and how they change for various ages provides a glimpse of the changes and shifts that are likely to occur as well as the timing of such changes.
Drozd, David, "Nebraska County Population Projections:
2010 to 2050" (2015). Publications since 2000. 149.