War?

I recently realized that in the background of the overall plot of 1984, world wars seem to be constantly going on. They have no impact on the plot whatsoever, but seem to always be there. I'm not sure how they started or how they're going, which makes me unsure why Orwell incorporates them. The Party might see them as a way to make their citizens embrace nationalism, but in my opinion there are many other ways to do this. Is Orwell simply adding to the pessimistic vibe of Oceania, or is there something more going on?