There's a bit in Boardwalk Empire where an Italian gangster orders spaghetti in a diner, just to see how badly they make it. Was spaghetti popular enough by 1923 that you could get it in non Italian restruants? Were roadside diners a thing by 1923?

by grapp

I always thought of roadside diners as a 1950s thing.

yodatsracist

While I can't say about spaghetti, I have another post looking at the history of pizza in America that may interest you.