Little Jebbie is correct on this. First generation immigrant families do have a greater number of children than the average American family, but after that the succeeding generations do have less and less.
Right now the national fertility rate for America is less than replacement levels (2.1 births per woman) which is now about 1.86.
U.S. fertility plummets to record low
Study finds fewer teen pregnancies and women waiting longer to have children
http://www.washingtontimes.com/news/2014/may/28/us-birthrate-plummets-to-record-low/?page=all
28MAY2014
(excerpt)
American fertility has reached a record low, driven by falling birthrates among teens and women in their early 20s, the federal government says in a new report being released Thursday.
The number of teen births in 2013 — 274,641 — was the lowest number ever reported for the United States, researchers said in their report on preliminary birth data for 2013.
Overall, America’s total fertility rate fell to just 1.86 births per woman, the lowest since 1986 and a 1 percent decrease from 2012. That figure puts the U.S. on the same course with many Western European nations and Japan, where the birth rate has fallen below what demographers call the “replacement rate,” usually around 2.1 births per woman, needed to keep a country’s population from falling. The U.S. last had a total fertility rate of 2.1 births in 2007.
With its new figure of 1.86, the United States looks like it will lag behind Australia (1.92), France (2.01), Sweden (1.91) and the United Kingdom (1.90) but have higher fertility than Brazil (1.81), China (1.66), Japan (1.41) and Russia (1.59), according to 2012 data from the World Bank.
I think one of the main reasons why the US federal government and the federal governments under the Europeon Union are allowing their borders to be overrun with illegal aliens as well as legal ones is because
1) western(ized) countries’ populations are having less than replacement levels of children,
2) more people are needed now than ever to saddle the monstrous debt on their shoulders generated by those respective governments via their social slavery number or equivalent in order to be able to keep borrowing.
Slavery through debt is an equal opportunity employer!
Responsible Americans stopped having as many kids when the economy crashed. I expect the birth rate for Americans to go back up to replacement level where it was after they feel they can afford to again.