Every single time the topic of the "Civil War" is broached, the knee jerk reaction of most people is to bring up "Slavery" as the dominant cause of the war. Any effort to get people to stay out of this rut is usually ineffectual.
But let's look at it (for about the 100th time) for a moment, shall we? (I didn't want to get side tracked onto this old dodge, but I am not surprised that we have.)
A Constitutional amendment requires 3/4ths of the states to approve it to become law. There were 11 states in the old Confederacy. With 11 States against, it takes 33 states to override, which would require a Union of 44 states to even attempt. (Assuming all 11 states that became the Confederacy would all vote "no.")
If the South had not left the Union, it would take until 1896 to achieve a Union that had 44 states in it. (Utah, which would have been the 44th state, became a state in 1896.)
So the nation would have had to wait until 1896 to even take the first vote on abolition of slavery. But wait! There's more! When we add the "No" votes of the five *UNION* slave states, (if they were fighting to abolish slavery, why didn't they abolish it in areas they already controlled?) Then it would require a Union that had 64 states to make it law. We still don't have a Union with 64 states in it.
Bottom line, Slavery wasn't going anywhere in the US of A. It was literally impossible to legally get rid of slavery at this point in history.
Add to this the fact that Lincoln urged the ratification of the original 13th amendment, (The Corwin Amendment) making slavery even harder to abolish, and now you have a virtual impossibility of ever getting rid of slavery in the United States Union.
Why don’t you talk about the seccesion documents of the southern states who justify rebellion not on tariffs but on the institution of slavery.
You mean all four of them? (Out of an 11 state confederacy?) Because the reasons why some states claimed they were leaving are not relevant to the reasons why the North decided to invade them. Without the decision to invade, there would have been no war, so the reason why the North invaded is far more significant than the reasons claimed by some of the Southern states to be leaving.
Why did the North feel the need to invade them? It wasn't because of slavery, because slavery had been legal in the Union for "Four Score and Seven years". 
Slavery, as I have shown above, was nearly impossible to get out of the Union, so it must have been for some other reason that the North invaded.
The answer is "Money." "Money" is the reason a war was launched against the South.
For some reason, you don't seem to want to talk about the money issue leading up to the civil war. I didn't ask you about slavery. (Yet here we are trying to side track the conversation into this ditch) I asked you about the European trade, and who was earning the money used to buy those imports.
I asked for your sources about who created most of the European trade. I'd like to get back to this focus on the money issue.