Was a Union state? I've pointed out before that even Pennsylvania could not keep Washington from bringing his slaves into their supposed "free" state.
So far as I can tell, no state could free a slave held by the laws of another state. Period. The fact that they did it anyways does not make it legally valid. They should not have been legally able to do this, but the Feds wouldn't intervene to stop them, and so they got away with it.
Many all but four of the States that remained loyal to the United States had outlawed slavery.
West Virginia makes five. And yes, states loyal to the Union could have slavery. It was all about loyalty and not at all about slavery.
“Pennsylvania could not keep Washington from bringing his slaves into their supposed “free” state.”
by 1860 there were no slaves in Pennsylvania.
“It was all about loyalty and not at all about slavery.”
Yes, because the power of the slaves interests in Legislatures of states was not nearly as substantial as they were in the States of the Upper and Deep South.
Two of the border states had outlawed slavery by the end of 1865. A third, had added a clause to their constitution to gradually outlaw the institution. By January 1865, only two states in the Union had legal slaery.