Answer:
The North and the South went to war for very different reasons. The South started the actual war and then the North chose to fight back. The South went to war in order to be able to rule themselves.
Explanation:
Monroe Doctrine was the early-19th century announcement that the American continents were not subjects for future colonization by any European country.
Germans sunk a passenger boat and didn’t care. This really made Americans mad.
I’m not sure if it’s right but I’m thinking maybe B I don’t know if it’s right though!