This was the standard from Britten ...
Slave Compensation Act 1837
Slave owners were paid approximately £20 million in compensation in over 40,000 awards for enslaved people freed in the colonies of the
Caribbean,
Mauritius and the
Cape of Good Hope according to a government census that named all owners as of 1 August 1834
Maybe if the US had offered to compensate for the loss of assets of making slavery illegal...The civil war would have less support in the South
The USA in effect applied Eminent Domain without compesation