Answer.
Incas were great engineers. They built a system of roads and bridges in the Andes. They secured unlimited manual labor.
The Aztecs constructed the double aqueduct. They also had engineering achievements by buildin causeways, and artificial islands. They had a number system, a calendar. great knowledge of medicine and they wrote beautiful poetry.
The Mayans developed the science of astronomy, calendar systems, and hieroglyphic writing. They had elaborate ceremonial architecture, such as pyramids, temples, policies, and observatories. They were great builders who built roads, and great cities. They also built elaborate monuments.
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