Yale Global. April 15, 2013.
Nations that manage to satisfy a large population politically, economically, socially can become beacons of hope for the rest of the world. The U.S. is the world’s third most populated country, trailing China and India, but could aim to become most populated by the end of the century: An eightfold increase in annual immigration would lead to a fivefold increase in the U.S. population, explains demographer Joseph Chamie. Immigration is a dominant force behind population totals for the U.S., as well as its balance between young and old and transmission of social values. [Note: contains copyrighted material].
Pew Research Center Social & Demographic Trends. November 29, 2012.
The U.S. birth rate dipped in 2011 to the lowest level ever recorded, led by a plunge in births to immigrant women since the onset of the Great Recession. Even with the decline, foreign-born women continue to account for a disproportionate share of U.S. births, 23% in 2010. [Note: contains copyrighted material].
http://www.pewsocialtrends.org/files/2012/11/Birth_Rate_Final.pdf [PDF format, 21 pages].