It can be inferred from the passage that by 1860 ______.A.half of the population lived to

It can be inferred from the passage that by 1860 ______.

A．half of the population lived to the west of Appalachian Mountains

B．Americans had long been desirous of new territories

C．westward expansion was a solution to the conflicts between the two parties

D．America"s industry was highly developed