Answer:
The Sumerians disappeared from history about 2000 B.C. as a result of military domination by various Semitic peoples. In particular, in about 2000 B.C. Sargon established an empire in Mesopotamia which included the area of Sumer. But long before Sargon's conquest Semitic peoples had been entering the area of Sumer.
Step-by-step explanation:
Hopethis helps! veryy srry This is ALL I know about their decline. sorry.