What if?

A story that intrigues me is the ”What if?” in historical fiction. With a bit of imagination and a “what if?” question, an author can go along way to alter the world we live in.
Such as in the Plot against America by Philip Roth. What if Charles Lindberg becomes the next president instead of F.D. Roosevelt? The possibilities to create a parallel universe are endless made by one simple question “what if?”
I think we need more of those books. Do you have any good “what if?” books or even a “what if?” questions that should have been answered and made into a book? Share your thoughts.
Josefine

My recommendations: Jules Verne, 20 000 leagues under the sea