What was the original purpose of the crusades

Why did river valleys most farming impact the lives of neolithic peoples?

Why did william blackstone believe that parliament was important?

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.