Except for the fact that the pro slavery argument was coming from the Democrats and they anti slavery position was held by the Republicans.
This massive disagreement became a national political conflict, and then a civil war.
This is an illusion. The Republicans pretended to be against slavery, but they were really against the "expansion" of slavery. They were fine with it continuing to exist in the places where it existed, they just didn't want it getting any more representation in Congress.
This massive disagreement became a national political conflict, and then a civil war.
So we have been led to believe, but the schism was more about representation in Congress than it was about actual slavery. It's been prettied up to make it look like altruism, but in reality it was all self interest.