But nobody before the 1857 Dred Scott decision even imagined that Southern slave-holders could move permanently to Northern free-states and still hold their slaves in bondage.
The basic principle here is very simple: Northern states must respect Southern slave laws by returning runaway slaves.
Southerners must respect Northern anti-slavery laws by not bringing & settling their slaves in free-states.
That's the law which you claim Washington "flaunted".
In fact, Washington conscientiously followed the letter of Pennsylvania's anti-slavery laws by cycling his slaves in and out within the allowed time period.
So, our Founders' original intentions are clear here, and it is the Supreme Court's 7-2 Dred-Scott decision which was way, way out of bounds.
There is no constitutional requirement to respect anti-slavery laws. There IS a constitutional requirement for Free states to recognize slave laws.
This is the sort of deal, that if you don't like it, you don't agree to it.
Requiring slave owners to abide by anti-slavery laws is an obvious infringement upon the rights which ARE written in the Constitution. You cannot forbid a man from traveling, and you cannot forbid him from bringing his slaves into a "free state."
According to the law of the time, they belonged to him, not the state or the people in the state.
A correct reading of the law during that time period offers NO SUPPORT for free states to ban slavery. None.
They can decree that people subsequently born in their states cannot be slaves, but they can do nothing to stop people from bringing in slaves born in other states.
It would have required a constitutional amendment to accomplish that.
In fact, Washington conscientiously followed the letter of Pennsylvania's anti-slavery laws by cycling his slaves in and out within the allowed time period.
You do realize that what you have said is an utter contradiction of your point? He "Flaunted" their laws by "cycling his slaves in and out within the allowed time period."
This is what we call a "loop hole" big enough to drive a truck through. The bottom line is this. Washington maintained slaves in Pennsylvania after Pennsylvania had banned slavery.