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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?
Dying to know which group uses tomato in their gumbo.
Creoles put tomato in their dishes, Cajuns generally do not. Creoles also tend to use more seafood while Cajuns will use more chicken + pork, on account of the former generally living in the coastal areas while the latter live more inland.
As the other poster said, Creole cooking generally contains tomatoes. In most places outside of New Orleans when you get "gumbo", it's generally Cajun-style. I honestly don't think I've ever seen Creole gumbo at a restaurant outside of the New Orleans area.
Which is good, because it's worse.