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Achievements:They also designed and built an extraordinary capital city. The island city included avenues, canals, long causeways, aqueducts, and dikes. The central plaza was surrounded by a large wall. Dozens of pyramids, temples and other buildings were scattered around the plaza.
Structure: The commoner class consisted of farmers, artisans, merchants, and low-level priests.
Physical challenges: located at the center of high-altitude valleys.

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Achievements: The Incas were magnificent engineers. They built a system of roads and bridges across the roughest terrains of the Andes. Through their system of collective labor and the most advanced centralized economy, the Incas were able to secure unlimited manual labor.
Structure: imperial structures, patios, temples, palaces
Physical challenges: They had coast lines, Mountains, and rugged areas.

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Achievements: the Maya developed a complex understanding of astronomy. They also figured out how to grow corn, beans, squash and cassava in sometimes-inhospitable places.
Structure: they made pyramids, towns, palaces, and ball courts.
Physical challenges:there were dry and arid land, rain forests, swamps, and coastal areas. Earthquakes were frequent. There was flooding and mudslides, hurricanes and droughts.