In which of the following books of 'Politics' Aristotle justifies slavery

The correct answer is Book 1.

Key Points

• Aristotle shows that the barbarians are natural slaves in Politics I by employing the methodology of his biological studies and nine causality and natural law principles that are understood from his physics, psychology, and biology.

• The definition of a natural slave according to Aristotle is "anyone who, while being human, is by nature not his own but of someone else."

• He also adds that "he is of someone else when, while being human, he is a piece of property; and a piece of property is a tool for action separate from its owner."

• Aristotle answers whether slavery can be natural, whether all slavery is against nature, and whether it is preferable for certain individuals to be slaves in the book I of the Politics.

•  His procedure is in line with his general way of thinking. 

Hence, the correct option is 1.