Did you mean between the Annunaki and the Atom Ant people?
Some interpreters of ancient texts would have it that Sumer ended after fallout from a nuclear exchange during a civil war between the Annunaki.
Not that I subscribe to it, but some of the arguments are interesting.
Did you mean between the Annunaki and the Atom Ant people?
Or, maybe God destroyed the tower at Babel and confused their languages, so there simply wasn’t anyone left who could speak Sumerian anymore. The Sumerians were a cosmopolitan people composed of various racial groups, centered around the correct geographical area, around the same time as described in that Biblical story.