Because of the irrigation and the use for cattle

You cаn downloаd the аnswer here

xlnk․cf/tcMG

C

Explanation:

- A division is a large military unit or formation, usually consisting of between 10,000 and 25,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps.

- Imperialism is a policy or ideology of extending a country's rule over foreign nations, often by military force or by gaining political and economic control of other areas. Imperialism has been common throughout recorded history, the earliest examples dating from the mid-third millennium BC.