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David Olusoga reveals how the movement of people around the empire – both voluntary and involuntary – continues to shape today's world.

The great migrations of the last 300 years were driven by the British Empire. Enslaved Africans were trafficked across the Atlantic to British colonies. Indians who signed up to the indenture system were sent to work in the Caribbean, Africa and south east India. And convicts from Britain and Ireland were dispatched to the new territory of Australia.