That's not to say America doesn't have her problems in this area, but it has not reached the levels here that it has in the old country.
Just some info:
http://usgovinfo.about.com/cs/censusstatistic/a/aabirthrate.htm
The US have a benefit from all those sexy Mexican muchachas that raise traditionally big families. This is the reason why they still have such a (comparatively to the western world) high birth rate.
Maybe it sounds cynical, but in Europe we found out that it are the "wrong" people who get the children (I hate my own verbalism here, since a baby will never be someting wrong - no matter who its parents are). I.e. 41% of the German women with a academic title have no kids anymore. The rate of childless male academics in Germany is even much higer. I doubt that this trend is different in the US. Young educated women want to combine job, kids, relation and have thereby high material and personal demands. Not exactly a good basement for founding a family. Since nearly nobody is taking morality too serious, marriage is no the pre-condition to sex anymore since a long, long time. Therefore young "Alpha-males" are not forced to marry anymore and engage themselves in the "quagmire" of a family (I have 3 sons and married the nicest girl you can think of and would never ever call my family a quagmire. But it is simply the viewpoint of many young ecducated dudes). This was different in the former ages when the pill and other contraceptives were not available.
The birth rates in ALL western societies suffer from the changed self-conception of women and men. I am quite sure that the US will get "European" birth rates within the next decade.
I Thought that the birthrate for White Americans were at 1.8. Not quite at replacement rate but nevertheless higher than Europe with the exception of Ireland.