I'd bet the rise in connectivity (everyone has a smartphone with video phone capabilities and so does their cousins in the old country) mean that integration is more or less impossible at this point, or that it at least requires a dedicated effort by the immigrant itself.
How did this slip past the censors? "There are significant differences within the population, especially between people with different levels of education, social backgrounds and countries of birth. Adults with low educational attainment have only limited adaptive problem-solving skills. Employed people have higher skills than those who are not employed."
Finally some nice words for neolithic farmers: “Where there was once mainly forest, there were now smaller patches of forest...A farmed Europe had a wider range of habitats for plants to live in than an unfarmed Europe.”
