There's always more to be said, but in the meantime you may find some historical context around the issue of slavery in North America and a comparison of some of the differences in its application and use in the Thirteen Colonies and British North America (Britain's Canadian colonies) in this thread by u/enygma9753.

The Thirteen Colonies had a large-scale plantation economy esp. in the South, which required the mass importation of slaves. Others may have more to say about the specifics of slavery in America after the Revolution.

This will focus on the situation in Canada. The colony had long been driven by the fur trade when it was New France. It had no plantation economy and didn't need such a large number of slaves during the 150 years of French rule prior to the fall of Quebec in 1759. The slaves that did exist in Canada were mostly indigenous people aka "Indians", though some black slaves also existed during the New France era. Black slaves would arrive in Canada in greater numbers after the American Revolution, when Loyalists fled America and brought their slaves with them in the 1780's.

Anti-slavery and abolitionist policies took root in Britain beginning in the latter half of the 18th century and spread to its colonies, though racist and discriminatory practices continued. Anti-slavery laws would be passed in Canada's colonial legislatures, even ahead of those in Britain ex) Upper Canada passed a law against slavery in 1793 -- decades ahead of Britain's own legislation.

There is a display in the Museum of the American Revolution about black slaves joining the British ranks in order to escape slavery. The slogan above it says: "Sometimes, freedom wore a red coat." This was a common sentiment among many black slaves, as more slaves fought for the British (up to 20,000) than for America (approx. 5,000-8,000).

During the treaty negotiations after Yorktown, George Washington demanded the return of escaped slaves (including his own!) who had fled to the British lines to enlist. To his credit, British commander Guy Carleton refused to do so and intended to honour the British promise of freedom to those who served the Crown.

Freedom is a relative term when discussing the experiences of freed slaves in Canada. In binary terms, they were not in chains and could pursue their own living. Those who fought for Britain during the Revolution and the War of 1812 were entitled to receive land grants and compensation for their efforts. While Britain did make efforts to fulfill some of these promises, it was often inequitable when done, or not done at all. The land grants were often on inferior land and the money they received for their services to the Crown was often less than what the white Loyalists received.

You can read more about the differing post-war experiences of black Loyalists in 19th century Canada in this thread, also by u/enygma9753.