It was very important for controlling the Mississippi River because it had easier trade since it led off to the gulf of Mexico which was an excellent trading spot, and well the north needed it to make trade easier to obtain
Tropical rainforest, the high mountains and wild rivers were some of the physical obstacles that the Incas faced. They had to build a complex network of roads to link the entire Inca empire. They had messenger stations along these roads so that they could relay their messages, and they built shelters along the way for travelers.
C plantations is the awnser
It decreased the population
