Compare advanced American civilizations with the four early river valley civilizations analyze map projections and explain uses of various types of maps
explain why ancient civilizations developed networks of highways, waterways, and other transportation linkages

How did inca develop their road system? a) they used mortar to hold the stones together.b) they built suspension bridges over rivers. c) they mixed copper and stone together to make the blocks.d) they laid roads in the cities, not in the less densely populated deserts.