I don't think the question of this thread is about what is authentic, but rather, how dishes changed when they hit the states, so that they are almost always made that way in the states, and yet are not known in their country of origin.
Spaghetti and meatballs are very american, as far as i can see, though italians do make meatballs, and sometimes make them in sauce but usually for a baked pasta dish for very special occasions. But i never saw it with spaghetti.
So how could this come about.
It's pretty well known that immigrants are more purist than their cousins in the country of origin about most traditions. So something must have happened, since they were invented b y immigrants.
I imagine that with the spaghetti and meatballs, either
1. this is a dish local to a small area, whose immigrants brought it to the states. Being a nice dish, it caught and took hold. Maybe they still make it in some village in Abbruzzo or something.
2. That they got to the states and found the only pasta available was spaghetti, back in the 1800s when the first wave of italians hit ellis island. Couldn't make their timballo with meatballs because it needed short pasta like rigatoni.
3. that the kids of the immigrants went to school and learned about those early ideas of nutrition where protein was considered only available in meat, and got the idea of putting meatballs in with the spaghetti
4. That they were overwhelmed by the abundance and cheapness of meat in the US and started putting it in everything.
or maybe none of those but somethign else.
I discovered that the american italian way of making lasagne (which my tuscan mother used, and my friend's neapolitan mother used, and my family friend's emilian mother used) was to put a layer of ricotta in it, while everyone i know here, from naples to tuscany to emilia-romagna makes it with bechamel.
I searched google in italian and found it is done that way in sicily. Probably most immigrants were too poor in the old country to make lasagne at all, and when they got to america, their sicilian neighbors taught them how. I remember my mother getting recipes for other italian dishes from her multi-regional italian friends all the time.
Submarines, at least the kind i know from boston, which were very much italian (italian-american) were made with prosciutto, salame, mortadella and provolone - cheaper versions with ham instead of prosciutto). No one puts that much variety in a sandwich here, and poor construction workers would bring half a giant loaf of bread and an onion to work. If they were well off, some cheese. But most likely their wives would go to the worksite with a basin of soup - vegetables, beans and bread. Certainly not cold cuts! Those were for the rich. And nobody ate sandwiches here as a meal except people who only had bread and onions and no wife to cook the soup.
And the submarine also has pickles, onions, tomatoes and hot pepper. Pickles!!??? They might be eaten with boiled meat in a formal dinner of the 1800s with the boiled meat course, but not in a sandwich, nowhere i've ever been, even today.
Kids did eat bread with a tomato rubbed on it for an after-school snack. But not with other ingredients.
But imagine these immigrants, finding themselves alone, without wives, trying to work in a factory or construction site with such a short lunch break that they had no time to make their soup, even if they wanted to, but could afford cold cuts, i think they would have piled it on like a sub.
All conjecture of course, but would be interesting to find out if anyone has any personal stories of these origins.