Which early American civilization built bridges made of earth, or causeways, to connect an island to the mainland? Aztec Maya Olmec Zapotec
the Aztec built bridges and causways to get to certain areas without getting wet.
The aztec, since they lived near water like the person above said ^ also because they were on islans, it only made things quicker, espeically because of the amount of hill there, hope i helped, tag me if you need anything :)