Oh stop it. You are lying to yourself now. If you could be honest with yourself, you would admit that Slavery was going to remain in the Union indefinitely without secession.
Here is the hypocrisy of people like you. You claim that something which was *NOT* going to change, was the reason for starting a war that killed 750,000 people directly, and indirectly killed perhaps an additional 2 million.
There was no attempt by the Congress to abolish slavery. But you know what congress *did* do? They attempted to amend the constitution to PROTECT slavery, and you know what? It passed both houses of Congress, and five states voted *FOR* it, before they stopped trying to ratify the amendment to further protect slavery. Lincoln urged that this pro-slavery amendment be passed!
Just stop with your false "the Union was doing God's work and fighting for freedom!" bullsh*t.
In light of the facts, I would be embarrassed to keep claiming that the Washington DC power block was fighting to stop slavery. They were not. They were fighting to get back that slave produced money stream that was leaving them because of Southern independence.
Or would you prefer to believe that Washington DC was motivated by morals rather than greed? Cause if so, I have a bridge in Brooklyn that I want to sell you.