Why was the Cuban missile crisis significant? A. Cuba threatened to invade the United States.
B. It came close to starting a full-scale nuclear war.
C. The United States almost fell under communist rule.
D. It promoted nuclear research in the Soviet Union.

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 !