Do you know of a good reference for the generational fertility of immigrants to Europe?
In the US second generation immigrants have fertility much closer to that of the population at large than first generation immigrants.
(so you could expect that people moving to the US have less grandchildren and so on than people that stay in countries with higher fertility rates; their emigration reduces the velocity of global population growth...)
No unfortunately there is not complete data, not for my country at least because we only keep track of immigrants in the first two generations, then they are considered "danish".
All though new evidence suggests that 3rd generation is much more religious, criminal etc. though I have seen no statistics about how many children 3rd generation "non western" immigrants have. You can read all about the fertility rate and population growth in Denmark in this PDF: http://www.dst.dk/Site/Dst/Udgivelser/GetPubFile.aspx?id=190...
This is official danish statistics, if it doesn't change, we will be a muslim country in a century or so. (Keep in mind that the PDF is pre-refugee crisis)
In the US second generation immigrants have fertility much closer to that of the population at large than first generation immigrants.
(so you could expect that people moving to the US have less grandchildren and so on than people that stay in countries with higher fertility rates; their emigration reduces the velocity of global population growth...)