Which of the 3 Meso-American civilizations did not have a written language?

This is a bit of a trick question! All three major Mesoamerican civilizations - the Maya, Aztec, and Inca - had their own written languages.

* Maya had a complex system of hieroglyphs, some of which have been deciphered.

* Aztec used a system of pictographs and ideograms known as Nahuatl.

* Inca had a system of knotted strings called quipus, which represented numbers and concepts but were not strictly a written language.

So, the answer is none of the three Mesoamerican civilizations did not have a written language.