I'd be careful with that claim.There is also a monument at the old slave market in Zanzibar - the Arabs were the slavers, shut down by the British. BLM owe us a vote of thanks.
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The man credited with closing down the slave trade was Sir Henry Bartle Frere who has a monument in St Pauls, He then went on to instigate the Anglo Zulu War which then led to the two Boer wars. Henry Bartle Frere - Wikipedia.