2. What did the Inca use in place of written language?

A quipu, or knot-record (also called khipu), was a method used by the Incas and other ancient Andean cultures to keep records and communicate information. In the absence of an alphabetic writing system, this simple and highly portable device achieved a surprising degree of precision and flexibility.

tree bark and or clay

agree with wilson that weakening the treaty would threaten world peace.