Tomorrow War is a movie people deride for many reasons. Some good. Others not. But there does appear to be more world building in the movie than made it to the screen. Probably because of the market the studio wanted. One thing people say about the movie is “Why don’t the world powers just nuke the aliens, or bombard them from the air?” Or other things. My first assumption as a writer is that they DID do that in 2048. The nations of the future mobilized their militaries. They threw everything they had at the aliens. And when they were overrun by the ultimate zergling rush, they nuked the aliens as a last resort. I’m sure they nailed a lot of the aliens, but not enough. The future we hear from in 2051 has 500k humans left. Every organized army has been shattered, and all we see when the wormhole opens are the last few desperate survivors, hoping a miracle can save them.