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The Transatlantic Slave Trade started shortly after the year 1500. The first documented case of slavery dates back to Juan de Córdoba, a Spaniard, who brought one African Slave to the Americas with the permission of his Spanish Crown. The first country to send slaves to the Americas seems to be thus Spain, only a few years after the discovery of America.
They both get payed, they both help the community, they both deal with pretty gross things as well.