A quick search for the causes of the American Civil War shows a lot of threads on the historical causes of the Civil War. I am looking more for an "on-the-ground", microcosmic perspective. For a typical Northerner in the Union army, what would he have said was the reason the war was happening? And what would have been his personal reason for fighting in the army?

I am also trying to take the temperature of Northerner "on-the-ground" attitudes towards slavery. Would he have said something like...

• A) "Slavery is morally wrong and Lincoln and the Union is fighting to abolish it. I think slavery is wrong too, that's why I'm proud to fight."
• B) "Lincoln doesn't want the nation breaking apart. Slavery is wrong, but the bigger issue is that the Union needs to be preserved."
• C) "I guess slavery isn't right, but I don't know what the big fuss is."
• D) "To be honest, I don't know why we're fighting. We don't have slaves in my state, but I don't blame the South for having them"
• E) "Slavery is in the Bible, and those Western territories should be allowed to have slaves."

Or something else? Which of these responses would have been typical of a Northerner? Would any of these responses be particularly out-of-place or egregious for a Northerner to express?