More exactly, the slavery of black people in the British North American mainland colonies started with a black man suing in court to keep another black man in slavery. The Spanish had held Africans in slavery in the New World for more than 100 years before Jamestown was founded. And Indians had practiced slavery for who knows how long (Cabeza de Vaca and his companions were slaves of a Texas Indian tribe for several years in the 1500s until they managed to escape).
Very true and more exact, I was just keeping it simple. IF we wanted to take this further, where did the British Colonies get those slaves? Black slave catchers in Africa. So, blacks started slavery and then became the hunters of other blacks and sold them into slavery. Great continent that Africa; not any better today, either.