Cultural achivements from the Mayan, Aztects, Incas

Maya practiced the burning and slashing of the enviroment, or that they adjustied to the ycatan river and had to live with it, they also had hydrolic engeneering Aztects had the ball game, hadhuge cities with temples, feice warriors, and a good rulling goverment Inca were multi ehtnic, had no writing, they built cities on the mountins, they freeze dried food, made bridges, and would work on brain surgery