Emphasis in the excerpt from the federalist no. 51 on the importance of a federal system that could protect civil rights was underscored most clearly in the early 1800s by the

Freezing meltingand evaporation

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 !