So did the US Constitution. Look up Article IV, Section 2. It is about requiring the return of escaped slaves to their masters.
In 1787, when the US Constitution was written, the vast majority of states were slave states. New Jersey was a slave state at that time.
The North went to war to preserve the Union AND bring and end to slavery and it did just that.
When the North went to war, it went to war to "Preserve" Washington DC control over all Southern economic output, and it did not care at all about slavery.
Almost two years later, it started "caring" about slavery, but not in any Union states, it only cared about slavery in Southern states not yet under its control.
Which means that it didn't really care about slavery.
And now Mr. Coward I answered your question, answer mine. If you have the decency . Or guts to.
What particular question have you asked me that I have not answered? If its the one about if the South would have kept slavery, I did answer that.
If its something else, I must have missed it.