Lest you balk and try to equivocate about that, had we stayed as British Colonies, slavery would have been "abolished peacefully" twenty five years before the Emancipation Proclamation during our bloody Civil War.
Don't try to deny that Northern States became wealthy on the slave trade or by exporting the products of slave labor in the Southern States.
They created the United States, a nation that the Conderates tried to tear apart. Facts are stubborn things.