Answer:
The Mongol Empire existed during the 13th and 14th centuries and it is recognized as being the largest contiguous land empire in history.
Explanation:
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Mesopotamia because farmers learned how to control the water levels so that their not too high or not too low so that crops can still grow and they also made a surplus when this happened. I hope that helped
Your answer is going to be ,it was divided by disagreements over which Muslims should be leaders. It turned into complete chaos.
He established a responsible government. He got rid of corrupt and no good administrators. He also changed the system of provincial administration so that all provincial governors were answerable to him!
I hope this helps !