Yes, and a lot of states got rid of slavery well before 1860, but someone said the Yankees still had slaves, so not true but for some corner of Delaware, whatever the details were.
Also, I have also seen it written per this talk of secession, that the government then, would have had the right to execute all who wished to do it per sedition.
It's in the discussion here: https://www.jacksonfreepress.com/weblogs/jackblog/2015/jun/21/confederates-speak-yes-we-fought-the-civil-war-ove/
Perhaps those defending slavery and a white supremacist society will find that of interest.
States like Missouri sure weren't Union states.
Work your way back to the OP.
There is a reason I mentioned the Revolution, namely that you stated some did not believe the 'all men are created equal' clause of the Declaration of Independence.
While defenders of the Union's invasion, destruction, forcible 'repatriation', and looting of the South point to Slavery as their great moral banner, the bottom line is that the increasingly industrializing economy of the North did not need slaves, except as house servants, and had plenty of Europeans to do the scut work--enough to slight the Irish, who 'need not apply'.
When you have some other group to stuff on the bottom of the socioeconomic totem pole, you can get all high and mighty about not forcing the servitude of those the Northern shipping magnates got filthy rich off of shipping to the South at a profit and without regard for their 'humanity'.
No one here is defending slavery as an institution or a practice.
The war was fought over economics, like all wars are, ultimately. Slavery became a hot issue not out of great moral purity, but because it was no longer a profitable venture in the North and an economic brickbat with which to beat the South, which the North was exploiting like a third world country--enough so that the trade in cotton persisted even during the war. At the time that labor force was essential to the production of Cotton and Tobacco, two major economic products of the South, cotton being a product with export value which ordinarily would have exceeded the price the Northern mills were willing to pay if not for other economic constraints.
Additionally, the South was industrializing on its own, and the war not only destroyed much of that industry, but set it back decades, allowing the South to be further exploited.
But as long as agitprop like the novels Uncle Tom's Cabin
are taught as "History", the view of that era through a modern lens will continue to be grossly distorted. After all, "The victors will be the judges, the vanquished, the accused." applied even then.