What understanding have archaeologists gained about the adena and hopewell peoples from objects found in the earthworks they left behind?

What were the terms behind germany's surrender during wwi?

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.

What mountains did the first transcontinental railroad cross