What is the answer???

c. manufacturing became more important to the economy

Explanation:

the North developed economically much more than the south in the first half of the 19th century serial squiggly abolished and the economy reverted to of industry to such an extent that during the civil war about 80% of the industry in the USA was in the North give an obvious strategic advantage to the latter

answer; i believe the correct answer is (the willamete valley);