The British stole many ancient African artefacts and then stated that the Africans had no history. The Benin Bronzes were stolen from Benin in West Africa and sold on all over the world. The British museum has benefited from this theft and actually makes money from the stolen goods. This trailer for a new film explains the background.
The British museum itself was founded on profits from the slave trade
www.blackhistorywalks.co.uk