What role did the spanish encomienda system and british sugar colonies play in introducing slavery to the southern colonies?

The two types of farm owning developed slavery because the owners of them were allowed to have slaves. The encomienda system was based on the idea that conquerors should have slaves to work for them, and it similarly applied to sugar colonies that had slaves on them. They were responsible for a lot of trafficking of slaves from Africa.

He would most likely post his laws in the city market

Are their any multiple answer's ?