Final answer:
The chronological order begins with Sargon developing the kingdom of Akkad, followed by his conquest of the Sumerian city-states, his armies moving south, and culminates in the unification of Akkad and Sumer.
Step-by-step explanation:
In answering the question of which event came first and last in chronological order involving Sargon the Great, we look at the sequence of his accomplishments. Sargon helped to develop the kingdom of Akkad first, as this was the foundation of his empire-building. Following this, Sargon conquered Sumerian city-states, it was then when he moved his armies south to extend his domain. Finally, Sargon united Akkad and Sumer, forging the world's first true empire and thereby completing his conquests.
In chronological order:
- Sargon helped to develop the kingdom of Akkad (earliest).
- Sargon conquered Sumerian city-states.
- Sargon moved his armies South.
- Sargon united Akkad and Sumer (latest).