Louisiana and Quebec are both settler-colonial territories at the mouths of major navigable rivers, and both have a history of Francophony. But why was French broadly displaced by English in Louisiana, while this has not happened in Quebec? What are the different historical factors that led to these different outcomes? In particular, what were the roles of the rivers, if any? What is the present language situation in these regions, and what would you predict the future language situations of these regions to look like?
There's a good episode of The Dollop, #277.
Like most things Dollop, it's more fun to go in blind.