The fertility rate in the United States fell again to another record low in 2012, in part due to the recession that is making couples more reticent to consider having more children in their family.
While abortion contributes to destroy more than one million unborn children on an annual basis in the USA, new figures from the CDC show the American population is at dangerously low levels — so low that the U.S. birth rate is below the replacement rate needed to sustain the population [replacement level is 2.1 children per couple per reproductive lifetime in developed nations].
http://www.lifenews.com/2013/09/10/u-s-population-falls-to-dangerous-levels-below-replacement-rate/