The Population Projections Program produces projections of the United States resident population by age, sex, race, and Hispanic origin. The 2009 National Projections are a supplemental series to the 2008 National Projections released on August 14, 2008, and provide results for differing assumptions of net international migration. All other methodology and assumptions, including mortality and fertility, are the same as those used in the 2008 National Projections. The four 2009 series are useful for analyzing potential outcomes of different levels of net international migration.
In the Zero Net International Migration series, the number of immigrants and emigrants is held constant at a value of zero for the entire projection period, thus assuming a closed population and no movement of individuals into or out of the United States. This series is provided for analytical purposes and does not indicate that migration has dropped to zero or that it is expected to fall to zero.