How could Britain have a greater population of black ppl prior to WWII ? Historically, Britain, including London, has had black ppl living there since Roman times, and there were racial tensions post-WWI (like the US Red Summer), when unemployed black seamen clashed with whites in such places as Liverpool in summer 1919 over jobs and local women, although it was only after WWII that large nos. of West Indians and ppl from the Indian subcontinent started emigrating to the UK and establishing their own distinct ethnic communities. What POD/s would be required for blacks to form as significant a portion of Britain's pop as they do now, at an earlier stage of hist ? What about something like larger nos. of former freed slaves after the ARW, repatriated from the South and NY to British ports, deciding to stay in England instead of OTL travelling to the West Indies or Sierra Leone ? Would such a higher percentage of blacks in the British pop have necessarily resulted in the 'rivers of blood' foreshadowed by Enoch Powell in the 60s, or would racism in Britain have not been as virulent as in the US ? How would Britain with a greater black pop have reacted to and influenced a US which continued to practice Jim Crow segregation ?