What happened on this land around c. 3000 BCE (Early Bronze Age)?

Emergence of urban centers (Susa, other lowland settlements), early writing and administration in the Susiana/Elam region; growing trade and cultural links with Mesopotamia.
Rulers
Local chiefdoms / proto-Elamite polities
c. 3300–2500 BCE
City-states and chiefdoms in the Iranian plateau and lowlands (proto-Elamite cultural horizon around Susa).
Battles
Local inter-city conflicts (archaeological evidence)
c. 2500–2000 BCE
Periodic warfare between lowland city-states and highland communities; not always recorded by name in written sources.