The development of the united states from a nation unsure of its own survival in 1860 to a world power?

Alright, I'll help you. However you will have to give me more details about your question first.

Ithink the answer is b. shakeri hope im not wrong : )

To solve their problems, mesopotamians used irrigation, a way of supplying water to an area of land. to irrigate their land, they dug out large storafe basins to hold water supplies these ditches brought water to the feilds. to protect their feilds from flooding, farmers built up the banks of the tigris and euphrates.hope ths !