Vermont amended its constitution to ban slavery in 1777. Other Northern states emancipated their slaves and banned the institution: Pennsylvania, 1780; Massachusetts and New Hampshire, 1783; Connecticut and Rhode Island, 1784; New York, 1799.
While some of the state laws stipulated gradual emancipation, ear notching and iron collars were not used.
I am well aware that neither you or I had anything personally to do with slavery, but you'd be well advised to transcend the myth regarding the benevolence of that peculiar institution.
After they had sold all their slaves "down the river" to the Southern states.
No fools they.