You just keep on setting up straw men and knocking them down. Very impressive!
Where on this thread have I said high birth rates are an unalloyed economic good? This thread is about the dire economic, social and military implications of population decline due to below replacement level birth rates.
A decline in the rate of how many illegal immigrants come into the USA is hardly the collapse of illegal immigration in these United States. There are still upwards of ten million of them living and working and reproducing here.
You do realize there is a difference between current rates of illegal immigration, and current numbers of illegal immigrants, right? Just because the rate of illegal immigration has collapsed, that's not going to change the static number of illegal immigrants already living here.
There are millions of them living and working here - that is my point - the rate of their importation being irrelevant to the fact that their economic benefit to their home nation comes from them NOT living and working there - but living and working HERE.
Do I need to explain that to you again?
Now why did a 7 child per woman birth rate NOT provide much of an economic boon to Mexico compared to the USA during the same time while we had a much lower birth rate? How did we manage to have a much better economy with a much lower birth rate?