Why do we have limited knowledge of pre-columbian art in the americas?

Given the inability to properly understand the artworks of the Pre-Columbian era in the Americas, as well as the inability to preserve them for historical analysis, the knowledge surrounding these works of art is limited due to the limited amount of information that is provided to us.

This would be tesserae.

Gouges, because, like there named, they gage the amount of space an object has to move around.hope this : )