Final answer:
Sargon of Akkad developed the world's first empire known as the Akkadian Empire during ancient Mesopotamia, marking the end of the era of independent city-states.
Step-by-step explanation:
The world's first empire was developed by Sargon of Akkad during ancient Mesopotamia. He conquered people of different languages, religions, and traditions, creating a centralized political entity over a vast area. This empire, known as the Akkadian Empire, marked the end of the era of independent city-states and laid the foundations for future empires in the region.
Learn more about Akkadian Empire