Who were the four main emperors in mesopotamia and what were their main achievements?

They were the Akkadian Empire, the Babylonian (bah-buh-LOH-nyuhn) Empire, the Assyrian (uh-SIR-ee-un) Empire, and the Neo-Babylonian Empire.

Beginning around 5,500 years ago, the Sumerians built cities along the rivers in Lower Mesopotamia, specialized, cooperated, and made many advances in technology. The wheel, plow, and writing (a system which we call cuneiform) are examples of their achievements.

Explanation:

julius caesar turned the roman republic into the roman empire by coming in and taking the "dictator" role during the time of a civil war (elites vs lower classes) winning battles and reputation, then declaring him dictator for life

hope this : )

by improved communication.