The British knew there would be less resistance by using local governments rather than British rule, and they knew that by using local governments only a handful of British soldiers would be needed to keep the colonists in line, leaving the bulk of the British army to be used were they were greatly needed.
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When Sargon overthrew Lugalzagesi and seized power he gained an already united kingdom which he could use to advantage in military campaigns to establish the first empire over all of Mesopotamia. He may have been helped in this by his own legend which established his humble backgrounds.
