Partially because the population of Québec was much larger than that of French Louisiana, the Québecois retained their French to a greater degree than their cousins to the south. (That being said, there are still at least 75,000 Louisianians who speak French, with upper estimates scraping 150,000.) The influx of Americans, along with a.) state- and school-supported efforts to eliminate the French language and b.) waves of patriotism after WWII that supported being a "real" (i.e. not French-speaking) American, put an end to French's dominant position in southwest Louisiana. New Orleans adopted English at least a couple of decades earlier than the rural area to the southwest.

There are also vestiges of French in Missouri, namely in Old Mines. A few dozen Missouri French speakers are left, a dialect quite close to Louisiana French. It is much more endangered than LF and will probably be extinct within twenty years, whereas LF is unlikely to ever go fully extinct.