This isn't really helpful, but Stephen Metcalf has been writing one for like the last decade and I wish he would finish it up. Rick Perlstein has one called Reaganland. I heard some interviews with him and I don't know if I totally buy his argument, but overall I think it's a good look at the decade. https://www.nytimes.com/2020/08/18/books/review/reaganland-rick-perlstein.html