Each section of the country benefitted in its own way from these differences. Which section of the country had the ultimate advantage going into the start of the Civil War?

South

Explanation:

Although the north had a much greater industrial advantage than the south at the beginning of the war, the south had more advantages, at least in the beginning. This is because the southern army was as large as the northern army and the first battles were fought in southern territories. That was what gave the south an advantage, since the southern army had the chance to fight on its own territory, knowing the entire environment and landscape of the place and therefore, having advantages both to attack and to defend itself.

d) in the state of iowa