NumbersUSA is the chief repository of immigration population research . . .  

• about the role of immigration policies in driving U.S. population growth 
• and the effect of that growth on the quality of life for the nation’s people, plants, and animals.

Every 30 seconds, a football field worth of nature in the United States is lost to development to accommodate the ever-growing number of people living inside U.S. borders. Occurring primarily near where most Americans live, these losses of natural habitat . . . 

• further distance people from access to the increasingly proven health benefits of regular exposure to nature,
• and are the leading factors in major declines in numerous species.

Since 1996, NumbersUSA has been the premier organization continuing the work of several federal commissions in seeking an American immigration population future in which both human and natural inhabitants can thrive.