What are some cultural contributions of the Inca?

The Inca made advances in engineering, art, and medicine.

The Inca used a tool called a quipu. The Inca used this tool as a record keeping system. Since they had no system of writing, the quipu was very important.

The Inca used the quipu to keep track of trade goods, military troops, and populations in the territory. Another type of quipu helped the Inca recall their history.