What was the use/significance of the pyramid structure at chichen itza?

To allow the natural downward flow of water to irrigate a large amount of land without needing to be  transported from one crop plot to another.

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a mogul empire was disbanded

president franklin roosevelt supported the tva as part of his first new deal measures approved by congress in 1933. this new agency was designed to control floods, produce electric power, and improve the lives of people living in the tennessee valley. the tva accomplished many of these goals despite problems.