Why did the Sumerians need to control the river? What happened if they did not?

Sumerian farmers solved this by building irrigation systems, to provide water for the fields. They built earth walls called levees, along the sides of the river to prevent flooding. They dug canals to shape the paths the water took.

Explanation:

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the colonists were also expected to pay a tax to meet the costs of establishing and manning the borders of the proclamation line which led to the belief that the king had sided with the indians despite pontiac's rebellion, against the interests of the settlers. this contributed to the causes of the american revolution.