Born in the USA: America and the Demographics of Underpopulation

The concept of "American exceptionalism" has been applied mainly to the political differences that separate the United States from the "Old World": the striking absence of any serious American socialist movement; the spirit of Manifest Destiny informing its foreign policy, and so on. But America’s exceptionalism extends beyond the explicitly political and into the nation’s very rhythms of birth and death. These rhythms constitute what may be described as American demographic exceptionalism.

source:

http://www.lifenews.com/2007/04/29/int-270/