Times change. National parishes served a clearer purpose in the age of immigration and Irish hegemony in U. S. dioceses. I contrast Winsted, Connecticut, population about 7,000, with nearby , much larger Torrington. In Winsted, Catholics have worshiped at St. Joseph's, a Franciscan parish that united the diverse "ethnic" Catholics since 1852. For 33 years, Fr. Leo da Saracena led the parish with storied vigor, and he baptized Dad. In Torrington, the larger population created national parishes, one history of which is http://www.torringtoncatholics.org/about.html
Likewise, Catholics of the Eparchy of St. Maron of Brooklyn have a church on North Main Street, where we went sometimes when we were too late on the walk to St. Francis.
Many industries throughout Connecticut closed in the past forty years, and people drive off to other types of jobs.
Archbishop Blair is the thirteenth ordinary of Hartford. Two auxiliaries have Italian surnames. Most predecessors seem Irish.