Perhaps more than domestic politics, it was the expanding scope of American foreign policy after the second world war that brought on the need for greater diversity in the foreign service.

ECONOMIST: Names on a marble wall

"There's a significant number of people who just don't get it and I think what we need to be doing is making sure that people really understand the importance of diversity in the police service, " he said.

BBC: Police chief Dal Babu criticises ethnic recruitment