The French in Canada had African slaves in the 1600s and 1700s before England took over in the 1760s...
There were many black Loyalists during the American Revolution...
escaped slaves etc..and slaves who accompanied their Loyalist masters when they fled into Canada...
They were given their freedom by the British when they went to Canada if they had fought on the British side...
also the Underground Railway ended in Niagara and then the former slaves went elsewhere to hide from the bounty hunters coming North to find them...
There are quite a few black Canadians...
There was another large influx of blacks when Upper Canada (now Ontario) banned the slave trade in 1791. The rest of the British Empire banned slavery in 1837.