As per a recent comment this thread is meant to voice contrarian opinions, that is anything this community tends not to agree with. Thus I ask you to post your contrarian views and upvote anything you do not agree with based on personal beliefs. Spam and trolling still needs to be downvoted.
The difference is only apparent; both societies have treated their nonwhites like trash. The British Empire merely avoided its "dysfunction" problem at home by outsourcing it to India.
Then why, despite the xenophobic laws of the 19th and early 20th centuries, are East Asians a dominant minority in the US? Why, despite a millenium of antisemitism, are Ashkenazim getting 27% of Nobels and making up about quarter [edit: not sure of exact number] of US billionaires?
White people have treated all nonwhites like trash at some point or another, yet there's a giant variation in outcomes. Racism as an all-powerful explanation of black dysfunction is untenable.