Answer:
According to my opinion it is the Babylonian Empire, because it had developed laws, trade and social systems, which led this Empire to flourish in the second Millennium BC.
Step-by-step explanation:
City of Babylon, capital of Empire was a religious and cultural center of the Empire, and the whole world back then. Additionally, the Empire was very vast. It stretched from the city of Mari to Persian Gulf. Hammurabi's Code was the first written law in history.