How did the Inca government unite its empire in the Andes Mountains

The Inca were able to control their empire through subordination and cooperation. They divided and conquered the people living there and then would move them, after conquering, to another place. This was a great form of control when the conquered people didn't have the "home terf" advantage. Each area of land had a local ruler or, curacas, and were allowed to maintain their positions and were given privileges in return for their loyalty to the Inca. Their series of roads and, tambos - or inns - allowed rapid communication and troop movement, thus allowing the Inca empire to be constantly united.