The Mesoamerican group with the most and longest written inscriptions are the

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The Maya civilization is known for their extensive system of hieroglyphic writing, found on monuments, buildings, and pottery across their territory. They created the only known fully developed writing system in Mesoamerica and left behind thousands of inscriptions, including books known as codices. The Aztecs, Olmecs, Zapotecs, and Mexica also had some form of writing, but their inscriptions are not as numerous or lengthy as those of the Maya.

The Mesoamerican Group with the Most and Longest Written Inscriptions