Of course the Spanish had been importing Africans to work as slaves in the New World from the very early 1500s, more than 100 years before the first Africans arrived at Jamestown. The Portuguese began capturing people on the coast of Africa and taking them either to Portugal or to their Atlantic islands to be slaves from around 1441. Of course they were just doing what the Muslims had been doing to non-Muslims (black, white, or whatever) for centuries, and what the Europeans had been doing to outsiders (whether pagans, Muslims, or the wrong kind of Christians) for centuries too.
I can only speak with any level of familiarity to the English colonies in North America. I understand that human bondage in its many forms was not invented on this continent, and the practice did not end in the world with the end of our so-called civil war. There are slaves today, held by the same group that has played such a large role in the practice going back a thousand years.