Historians have regarded the american revolution as being of worldwide importance because it a) was won without foreign military assistance. b) was led by people of recognized intellectual ability. c) ended european imperialism in the western hemisphere. d) marked the successful emergence of a new concept in government.

D) marked the successful emergence of a new concept in government.

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 !