•why did slavery start in the colonies?

Slaves cost more than servants, so initially only the wealthy could invest in slaves. The first British colonists in Carolina introduced African slavery into the colony in 1670, the year the colony was founded, and Charleston ultimately became the busiest slave port in North America. So that all labor was being done easier and the wealthy would be able to sell their slaves in order to establish royalty and have more money.

Hope this helps you!!!