Answer:
It was legal; Colonists in the Carolinas came from the Carribean where slavery was common; & the practice of using indentured servitude against carolinas charder.
Sir Fergus Graham Burtholme Millar FBA is a British historian and Camden Professor of Ancient History Emeritus, Oxford University. Millar numbers among the most influential ancient historians of the 20th century.
They pass them even if they are not popular if they feel they will be a good thing for the public.