What three tribes conquered and ruled mesopotamia after the decline of sumer's city -states?

The Sumerians, the Akkadians, and the Babylonians

Explanation:

The Sumer city-state wasthe first civilization, it started around 6 thousand years ago and it set the basis for other civilizations that came after. They had advanced agriculture and a well-developed written language. After the decline of the city-state came other important tribes.

First, the Sumerians who  Invented the wheel and built several cities.

Then the Akkadians took over and grew to the point of becoming the first-ever empire.

Afterwards, the Babylonians took control, one of their achievements is that they wrote the Hammurabi's Code.

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