It’s hard not to notice that “12 Years a Slave,” arguably the greatest depiction of the American sin of slavey, comes courtesy of British filmmakers with roots all over the world. London-born director Steve McQueen’s family is from the Caribbean; the film’s star, Chiwetel Ejiofor, was born in London to Nigerian parents. Co-stars Lupita Nyong’o and Adepero Oduye hail from Africa.
