I recently picked up a copy of "Science in the Kitchen and the Art of Eating Well", a fascinating book first published in 1891 about middle-class Italian cooking. It has a recipe for chicken marsala that doesn't have any mushrooms, which is very different from what is contrary to my experience with the dish.
I became curious about the history of chicken marsala, so I checked out the wikipedia page, which claims that the dish is an Italian-American dish made from chicken, mushrooms, and marsala wine.
So here's the question: is chicken marsala an Italian dish, or is it an Italian-American dish? Is wikipedia right, or does it need an update?