The Incas didn't have writing: https://en.wikipedia.org/wiki/Inca_Empire

(They did have a knotted string message system, but it couldn't contain full language: https://en.wikipedia.org/wiki/Quipu .)

The Maya did have writing: https://en.wikipedia.org/wiki/Maya_script

If you don't know, and don't want to spend a few seconds searching, asserting things doesn't contribute to the conversation.