Give 4 examples of early empires in the nile and tigris/euphrates river valleys

The correct answer can be Egypt, Nubia, Akkadians, Sumerians

Egyptians were where Egypt is even today while Nubians were a bit down south down the river. Akkadians and Sumerians were there just like Babylon was until Sargon of Akkad united them all into a single empire. The common name for that region is Mesopotamia because it's between the two rivers.