divisions, or Suyus: Callasuyu was south, Antisuyu was east, Chinchasuyu was north, and Cuntisuyu was west and they branched out from the capital Cuzco. These divisions were not equal in size and they were made up of several provinces. The ideal was for each province to have about 20,000 households. Much of the accomplishments made by the Incas were based on the culture, lifestyles, discoveries and doings of earlier cultures that inhabited the area. For instance, the Inca road system was an elaboration of a system built earlier by the huari culture . The Incas built their empire in less than a century. Even more extraordinarily they were able to organize conquered groups into a single empire functioning as a unit and they tailored their policies