Courtyard houses consisting of multiple separate residences have been built in many regions and eras, including the earliest Chinese dynasties and the Inca period.

However, silver and lead artefacts have been found in the Peruvian central highlands dated in the pre-Inca and Inca periods.

Only in the 1980's did Peru's population finally surpass the peak of Inca period, attaining 22 million.

In the Inca period, the messengers spreading throughout Empire known as chaski carried along a pututu, which was blown to herald their arrival to a particular place.

This phase lasted from the beginning of the Inca period until the end of the rule of Pachacuti (or Pachacútec).

Under their kings, the shyris, the Caras formed a powerful military state that would survive and dominate the Ecuadorian highlands up until the Inca period.

Most of these date to the Inca period circa the 15th century AD.

During the Inca period, men were required to work 65 days in the field to provide food for his family.

During the Inca period people were mostly depended on the cultivation of their land.

During the Inca period people had to work four months in mines, then they returned home.