EARTH - Wari, predecessors of the Inca, used restraint to reshape human landscape

The Wari, a complex civilization that preceded the Inca empire in pre-Columbia America, didn't rule solely by pillage, plunder and iron-fisted bureaucracy, a Dartmouth study finds. Instead, they started out by creating loosely administered colonies to expand trade, provide land for settlers and tap natural resources across much of the central Andes ...

http://phys.org/news/2013-10-wari-predecessors-inca-restraint-reshape.