Choose the statements that explain the disparity between the north and the south at the beginning of the civil war that gave the north an advantage. a) more than 70% of railroads were located in the north providing a greater capacity to transport food, troops, supplies, and other materials. b) prior to the war, many southerners knew how to hunt and ride a horse, translating to a skilled cavalry. c) all of the u. s. navy remained in the hands of the federal government. d) the north had a huge population, mostly through immigration that provided a potential source of manpower. e) the south's plan was to fight a defensive war by bringing their southern enemy into their territory and exhausting them. f) the economy of the north was based primarily on manufacturing, while the economy of the south was based on agriculture.