OK folks, here are the population projections from the U. S. Census Bureau. The current population of the United States is estimated to be 313,279,753 at 3:41 pm Central Standard Time today, March 31, 2012. If the USA were to have zero net international migration from 2000 to 2100 the total population would end up at roughly 378,000,000 in the year 2100, and if the USA were to follow the highest immigration projection rate, which we seem to be following (especially if you include some of the millions of unauthorized residents that probably did their best not to be officially counted in the census, and also see article from The New Republic), the population of the USA would reach roughly 1,182,000,000 by the year 2100. Yup, that's one billion one hundred and eighty-two million residents in the USA by the year 2100. Now you can see why we need to keep our net incoming international migration way down. I have yet to meet an American who says that he or she wants the country's population to reach one billion any time in the foreseeable future.
To see the U. S. Census Bureau population projections for yourself go to:
www.earthdirectory.net/PopulationProjections2100.pdf
To see the U. S. and World Population Clocks go to:
www.census.gov/main/www/popclock.html