Catholic universalism and particularism

In a footnote to my previous post concerning the relationship between Christianity and nationalism, I wish to add a more specifically Catholic perspective on the issue. Many try to argue about the universalist nature of the Catholic Church as a way to claim that Catholicism and nationalism(or any form of particularism for that matter) are incompatible. In response to such claims I offer the insights of the late Adrian Hastings:

"The point is that Catholic Christianity, understood in a wide sense, was both incarnationalist and universalist - it tended to both identify closely with particular communities, cultures, and nations, and to insist upon a communion transcending such particularities. It oscillated, one might say, between Old and New Testament sources of inspiration."
-- The Construction of Nationhood: Ethnicity, Religion and Nationalism pg.203