It's difficult to believe, but just 100 years ago a food as commonplace as spaghetti with tomato sauce was considered somewhat exotic; at the least predominately an ethnic Italian dish.
Even 50 years ago, chicken was considered an 'occasional' meat. Cornell university is famous for a basting sauce, as a result of an effort to encourage more domestic consumption of chicken.
I wonder if Pad Thai, bulgogi, or stretchy Turkish ice-cream will be considered everyday foods in another 50 years.