There is this big fat volume that surely will answer a lot of questions about The States
Americana. Storie e culture degli Stati Uniti dalla A alla Z (Milano, Il Saggiatore, 2012), edited by Mario Maffi, professor of Anglo-American Literatures and other researchers of the University of Milan: Cinzia Scarpino, Cinzia Schiavini, Sostene Massimo Zangari.
Pros and Cons.
Pros: variety, there’s un po’ di tutto, ‘a little bit of everything’. Completeness: any concept described, any definition, always includes an historical explanation, examples, and a complete bibliography.
Cons: it’s a dictionary. As a consequence not the kind of book you can read from the fist to the last page.
But excellent for reference or to satisky your curiosity