This still leaves out a lot of externalities and external drivers of immigration though.
But AFAIK Uruguay probably has the best immigration policy in that regard (Edit: well reading more recent articles about that, it seems to becoming less good in practical application).
best meaning not discriminating on the basis on religion/ethnicity/etc, plus being relatively opened to immigration
This still leaves out a lot of externalities and external drivers of immigration though.
But AFAIK Uruguay probably has the best immigration policy in that regard (Edit: well reading more recent articles about that, it seems to becoming less good in practical application).
Uruguay’s immigration policy?