The Mesoamerican Civilizations made a calendar that was remarkably accurate. The Mesoamerican Civilizations used hieroglyphics to communicate. The Mesoamerican Civilizations mostly grew maize but also grew squash , pumpkin , gourd , chill peppers and avocados. The Mesoamerican Civilizations made aqueducts that provided fresh water from springs. The Mesoamerican Civilizations developed some kinds of art, architecture, math, and calendars.