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I haven't read the article but I have read this: https://www.amazon.co.uk/Forgotten-Slave-Trade-European-Slav...

Not the best book I've read but it was pretty eye opening.

Slavery was pretty much universal since the dawn off human civilizations.

On the topic of England and slavery, it was so bad that Islamic slavers established a base on lundi island of the coast of Devon at one point.

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