To understand the subject of this book, which is of course slavery, properly it will be necessary to bear in mind that across the world slavery has been an accepted and unremarkable institution for thousands of years. It has been widely practised throughout the whole of human history, right up to the present day. According to the United Nations, there are currently somewhere in the region of 25 million slaves in the world (UN News, 2019). It is notable that even in the earliest mentions of slavery, dating back 4,000 years, there is no suggestion of novelty about the practice, which indicates
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