When it comes to migration, no one ever talks about the consequences of moving from a high context to a low context culture. https://en.wikipedia.org/wiki/High-_and_low-context_cultures
Aladair Macintyre: "Consider what it is to share a culture. It is to share schemata which are at one and the same time constitutive of and normative for intelligible action by myself and are also means for my interpretations of the actions of others" https://toutcequimonte.files.wordpress.com/2015/02/macintyre...
Low context cultures are more atomized and legalistic. Free migration is one of major the things that justifies the national security state powers... which ironically these days in the west there is no sense of a nation outside of the state. There is a weakness in that notion because the internet has weakened the state's ability to integrate minorities because those people can live mentally in their homelands.
Aristotle on immigration: "Another cause of revolution is difference of races which do not at once acquire a common spirit; for a state is not the growth of a day, any more than it grows out of a multitude brought together by accident. Hence the reception of strangers in colonies, either at the time of their foundation or afterwards, has generally produced revolution;"
Aquinas on immigration: "Thirdly, when any foreigners wished to be admitted entirely to their fellowship and mode of worship. With regard to these a certain order was observed. For they were not at once admitted to citizenship: just as it was law with some nations that no one was deemed a citizen except after two or three generations, as the Philosopher says (Polit. iii, 1). The reason for this was that if foreigners were allowed to meddle with the affairs of a nation as soon as they settled down in its midst, many dangers might occur, since the foreigners not yet having the common good firmly at heart might attempt something hurtful to the people."