Why does the author weave in reminders that a war is imminent in the book Fahrenheit 451?

The reminders of an imminent war in Fahrenheit 451 serve to intensify the atmosphere of fear and tension in the novel. They highlight the unstable and chaotic world that the characters inhabit, adding to the sense of urgency and danger in their lives. Additionally, the looming war acts as a backdrop against which the destructive consequences of censorship and suppression of free thought are more starkly portrayed.