Britain FORCED slavery on America.
"The legislatures of some of the colonies have done what they could to put a stop to the importation of African slaves, by loading it with the heaviest duties: And others have attempted the total abolition of it, by acts of assembly which their (Royal) governors refused to pass." - (October 18th, 1776)
And as has been pointed out to you before on at least one other thread: they were British colonies, chartered as such with the King as sovereign. In the realm of legality and government, the British sovereign's authority (as exercised by the King and/or Parliament) overruled the colonial legislatures de jure. That difference in opinion regarding governance was one of the factors leading to the American Revolution.
Alas, when the colonies revolted and declared independence, clearly not every colony was so keen on ending slavery as John Erskine alleges, since history dictates otherwise. Some wanted to end it; others didn't. Hence the numerous compromises.
And so, as has also been pointed out to you before, blaming the British at some point loses its sting when the Empire goes and abolishes both the slave trade and then slavery itself decades before the United States does.
“Britain FORCED slavery on America.”
It is worse than that. Much worse.
After the Americans won the Revolution, Britain forced thirteen of the thirteen states to vote to include slavery in the U.S. Constitution.
Later the British forced U.S. Grant to own a slave or two.
Eventually Grant broke free of British control and freed his slave but Mrs. Grant was still under their spell.
That still rankles me (what the Brits did). Bad, bad Englishmen.