Slavery vs. wages.
Strong sentiment on both sides of the WBTS but nowhere do I get that the war was over the moral issue of slavery.
"Slavery is likely to be abolished by the war power and this I and my friends are in favor of, for slavery is but the owning of labor and carries with it the care of the laborers, while the European plan, led on by England, is that capital shall control labor by controlling wages. The great debt that capitalists will see to it is made out of the war must be used as a means to control the volume of money." Private circular of Northern banker, late 1861.
The document you quote (incorrectly) is known as the "Hazard Circular." It's usually credited to London bankers, not northern ones. Sometimes it turns up in antisemitic rants, making the connection between the European banks and the Rothschilds. In any case, it's provenance is not much better than the Protocols of the Elders of Zion.
It looks like you cut and pasted it out of the League of the South's site, since the error and attribution are identical.
Come again?
...but nowhere do I get that the war was over the moral issue of slavery.
It wasn't, for the Union. But there can be no doubt at all that the primary motivator for the southern secession was to protect slavery. As to why they felt a war was necessary to do it, well, that was definitely a mistake on their part.