Answer:
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Step-by-step explanation:
Inca's: They built a system of roads and bridges across the roughest terrains of the Andes. The Incas developed superb architecture and engineering techniques without the use of the wheel and modern tools. The Incas did not have a written language but had an accounting system. The quipu was a collection of colored strings of alpaca, llama or cotton threads used to record accounting information in the form of knots.
Maya: Maya Engineers created aqueducts which used water pressure technology. The Maya developed the only complete writing system in Mesoamerica.
Aztec: They perfected the technique of creating artificial islands called Chinampas. They constructed a double aqueduct to bring fresh water to Tenochtitlan.