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The Incas exchanged populations in conquered areas. This was part of the creation of anInca highway, which was 30,000 kilometers long (aprox. 18,000 miles), and every 20 kms. there was supposed to be an "inn", in which you could spent the night and eat, and for the military business they could keep supplies and weaponry.
According to Kenneth Adrien, in his book Andean World: Indigenous History: Culture and Consciousness there were 2000 inns stretched out evenly through the 18000 miles of highway roads. 300,000 beaurocrats moved about through these inns in an empire that was actually much more organized and civilized that many believe it to be.
There were two main roads that existed in the Incan Empire. One was stretched out near the coast, the other further inland. These roads were used exclusively by the Incan military as a way to relay messages. Messages supposedly could be carried at 150 miles per day by runners. These runners carried the messages through quipu or through oral ways. Unfortunately for the Incas, these elaborately designed road systems hastened the empire's demise. Almost all these roads led right to the capital, Cuzco and Pizarro and his Spanish conquistadors used it to overtake the Incas.
