JS, my sometimes ally and always friend, may see the imprint of a Catholic education (and not a socialist drive independent of that) in what I have to say. In its most basic formulation (I so often speak in terms of basics because I apparently lack the sophistication, often, to address details), the problem with Mexican immigration, which is the heart and much of the corpus of our present immigration concerns, is that we are enforcing the distribution of the means of living. The Catholic Church, far beyond the parochial issue of increasing its US ranks with largely coreligionist immigrants, I suggest, is motivated to "feed the hungry, clothe the naked," and so on through all the modern-day analogues of Christ's concerns for social justice. This theme of social justice, of course, is not limited to immigration, but I deduce that it is a large bit of the moral force the current immigration movement carries.
National boundaries mean less as a moral imperative than soundly and consistently progressing with a program of ordered liberty to address the basic needs of people who are willing to work and contribute. These principles (and, characteristically, I don't have any details to share) apply by analogy to other developing countries, some earning the frank moniker of "Third World" in Africa, Asia, Latin America.
