Completar frases SLAVERYVersión en línea CLIL PROJECT por jose luis pedrero 1 prisoners legally TRADE ancient human free A slave is a person who works without being paid ; he is not , he hasn't got rights . Slavery has existed since times when the war went to the winners as slaves . In 1500 AD a real human beings trade , called SLAVE , began . In Europe , it will be accepted until 1815 . In the USA , until 1865 . In Spain , until 1888 .