What did andrew carnegie, gustavus swift, and john d. rockefeller have in common?

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 were the sites of three major battles the french army fought between 1805 and 1809?

What thematic reasons does the book list for european expansion