Step-by-step explanation:
The orders of the events are:
1. The Akkadians establish the world's first empire. (which happened around 2334 BC)
2. Ancient Sumer develops self-governed city-states. ( which happened around 2000 BC)
3. King Hammurabi creates his code of laws. (which happened around 1970 BC)
4Nebuchadnezzar rules the Neo-Babylonian Empire(which happened around 620 BC)