Corn/potatoes are an ingredient, they make a relatively bland restaurant dish with just what native flavoring you could add. We're now also expanding to the even larger definition of "Native American" to refer to groups of people's over 2 continents e.g. modern potatoes were the ones from Chile directly not the descendents that spread north naturally. Corn was a lot more like the corn of today but again as an ingredient not a dish (think of the number of corn dishes that start with butter for example).