The film The Caine Mutiny helped inspire the 25th amendment to the US Constitution. That's based on a book, so even if you want to narrow it to literature, it s

The film The Caine Mutiny helped inspire the 25th amendment to the US Constitution. That's based on a book, so even if you want to narrow it to literature, it still works. https://www.washingtonpost.com/news/morning-mix/wp/2018/09/10/how-the-caine-mutiny-and-the-paranoid-capt-queeg-contributed-to-the-debate-over-the-25th-amendment/ https://www.washingtonpost.com/news/morning-mix/wp/2018/09/1... Of course, nothing happens just because someone saw a movie about it. The 25th amendment was also prompted by the assassination of JFK, and the new awesome responsibilities of the US president in nuclear brinkmanship. But I think literature and especially film are a kind of artificial experience, a memory of something that never happened. And we can start to take steps to realize or avoid those events. These effects can be subtle, but not that hard to trace. For instance, the police greatly benefit from their nearly universal portrayal as heroes on film and TV. I think you can draw a direct line from that to the massive police budgets you see in North America.