Slavery takes many forms, this is what dominated in the US.
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As a social institution, chattel slavery classes slaves as chattels (personal property) owned by the enslaver; like livestock, they can be bought and sold at will.[16] While some form of slavery was common throughout human history, the specific notion of chattel slavery reached its modern extreme in the Americas during European colonization.[17] Beginning in the 18th century, a series of abolitionist movements saw slavery as a violation of the slaves' rights as people ("all men are created equal"), and sought to abolish it. Abolitionism encountered extreme resistance but was eventually successful; the last Western country to abolish slavery, Brazil, did so in 1888.[18] The last third-world country to abolish slavery, Mauritania, did not do so until 1981.