Final answer:
The Aztecs constructed causeways to improve their city's infrastructure and facilitate travel within Tenochtitlán by connecting different parts of the city to the main island.
Explanation:
The Aztecs constructed causeways primarily to improve their city's infrastructure and facilitate travel. By building causeways, they were able to connect different parts of their city, Tenochtitlán, to the main island. These causeways were constructed by driving pylons into wet marshy land and covering them with stone and rock, allowing travel on foot.
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