Slavery had always been a part of human history,but how was it different by the seventeenth and eighteenth centuries?

Question

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By the seventeenth and eighteenth centuries, slavery had shifted from "societies with slaves" where slavery was a part of the society but not the dominant feature to "slave societies" where slavery was the foundation and central component of the society. In these slave societies, slavery was a race-based institution where Africans were forcibly brought to the Americas and treated as property rather than humans. This was a significant difference from earlier forms of slavery, which were not based on race and did not involve the forced transportation of people.

Slavery Had Always Been a Part of Human History,but How