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Adam Smith wrote 'The Wealth of Nations ' in 1776. He wrote that slaves were the most inefficient and costly form of labour that could be used. Sugar could be produced more cheaply by paid non-slave workers in India. Some argued that British industry no longer depended so heavily on the slave trade.
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Answer: immorality of enslaving another human being is a key argument againt slavery. This argument has been used by many people, for example, Abraham Lincoln. Answers B, C and D were historically used as justification for why slavery should continue.
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