Slavery in the North was a shadow of what existed in the South, pal.
If you had any facts to back up your claims here, that might be a factor.
But sadly, you don't.
ontap: "Sorry pal but northern slave owners are the same as southern slave owners."
Except the Union slaveholders never declared secession & war on the United States.
That's why they kept their constitutional protections of slavery until overturned by the 13th amendment.
ontap: "And freeing slaves you have no jurisdiction over while you pass on the ones you could actually free smacks of political chicanery!!!"
The Emancipation Proclamation freed slaves in Confederate states at war against the United States, then the 13th amendment freed all US slaves.
No "chicanery", political or otherwise, involved.