Here in Maine a quarter of the population is of French Canadian descent and we have many summer tourists from Canada. Both Canadian and Quebec flags are common and bother no one. The history of the French here may be instructive to those in the Southwest. In northern Maine many of the original settlers were French in areas close to Canada and cut off from the rest of the state. Most people here of French ancestry are descended from immigrants to industrial towns who came in the late 19th and early 20th centuries. Very strenuous efforts were made by their leaders and especially Catholic clergy to promote separatism and use of the French language by having church services in French and educating children in French-language parochial schools. It didn't work.
French is still spoken to some extent up in border towns, but otherwise is generally spoken or understood only by old people.