Well, Mid World could connect Stephen King stories in a few ways. One way is through the idea of different dimensions or parallel universes that King often plays with. Mid World could be like a hub or a nexus point that links these various story worlds together. Another aspect could be the way characters in different stories might be unknowingly affected by the forces or events in Mid World, creating a sort of underlying connection.
Mid World might connect Stephen King stories by serving as a source of the unknown and the terrifying that seeps into the different storylines. Consider the way that King often has an overarching sense of dread in his works. Mid World could be the origin of this dread, and as different stories unfold, they are all touched by the influence of Mid World. It could be that the dark magic or the ancient evils that reside in Mid World find their way into the various settings and characters of King's stories, whether it's a small town in Maine or a post - apocalyptic landscape. This creates a web of connection that ties the stories together, even if it's not always obvious at first glance.
Mid World might connect Stephen King stories through shared themes. For example, the concept of horror and the battle between good and evil is common in many of his works. It could also be through recurring elements like certain types of monsters or supernatural forces that exist in different stories but seem to have a connection to Mid World.