What happened on this land around c. 2000 BCE (Middle Bronze Age)?

Elamate resilience and periodic Mesopotamian incursions; consolidation of local elites and administrative systems.
Rulers
Old Elamite kingdoms
c. 2000–1600 BCE
Elamite polities centered on Susa dominate southwestern Iranian lowlands.
Mesopotamian states (e.g., Babylonian influence)
c. 1900–1600 BCE
Babylonian/Kassite and other Mesopotamian powers exert influence across lowland plains.
Battles
Campaigns of Shulgi of Ur III against Elam
c. 2094–2047 BCE
Ur III incursions into Elam; demonstrates Mesopotamian-plateau interactions.