"Millions of Northerners opposed slavery in 1860 . . ."
I'd like to know how you know that? Maybe millions did oppse it, but I suspect most could care less as it did not effect them directly. I also suspect that most of the Union soldiers were not in the Army because they wanted to free slaves. This is the mumbo jumbo of revisionist history.
I'd like to know how you know that [millions of Northerners opposed slavery in 1860]? Maybe millions did oppse it, but I suspect most could care less as it did not effect them directly. The majority of the people who voted for Lincoln must have been anti-slavery Republicans, because they also elected anti-slavery Congressmen.
I also suspect that most of the Union soldiers were not in the Army because they wanted to free slaves.
I think the fact that most Union soldiers were Lincoln supporters who did not desert when Lincoln issued his Emancipation Proclamation is pretty strong evidence that they were anti-slavery.