Stop. The people getting the benefit of keeping the Southern money streaming into their pockets did none of the actual fighting. They paid $300.00 and some poor schlub took their place in combat.
And the poor schlubs didn't give a rat's @$$ about slavery. They were fighting because they had to. Yeah, there was the occasional crackpot all filled with zeal to go free the slaves despite the fact they all hated black people, but most normal people weren't fighting slavery. They marched right through slave holding Maryland to go fight the people who had the gall to tell Washington DC to go f### itself because they weren't funneling any more money into it's corrupt pockets.
The war was about rich northern people remaining rich northern people because the rich southern people would be prevented from trading directly with Europe and thereby depriving the rich northern people of both markets in the south and midwest as well as the rich northern people gloming onto the income stream produced by Southern exports.
And then the rich northern people told all the idiots in the Country they were fighting for some noble bullsh*t about freeing slaves. These were the very same people that offered the Corwin Amendment permanent slavery to the nation.
Let me show you a map that might give you a clue how things really work.
About your map, China uses slave labor for their manufacturing too.
Brought to you by the same liberals that run the country today, and ran it for the same reasons back in 1860. They don't care about slavery, they care about money.