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You are in large measure confusing causes and effects though. African-Americans are the descendants of involuntary migrants who, even after slavery ended, lived under extremely discriminatory legislation that severely restricted their rights to property and voting for a long time. East Asians are mostly selected immigrants from the best-educated strata of their own societies. (Even South Asians in the US are too).
Also, what about variation in (real or perceived) differences of IQ, intelligence and academic/economic success within races/continents? Finland and Albania aren't the same, after all. For that matter, Koreans in Japan tend to do much less well than ethnic Japanese, since they are a marginalised group there, even though Japan and Korea have similar IQ levels and (in the case of the South) similar levels of economic performance. And in the UK, Indians tend to do a lot better than Pakistanis and Bangladeshis, and similarly West Africans compared to Somalis and Caribbeans, because of the different nature of those migrations to begin with and their different cultural values and priorities.
Btw, the lowest-performing group of all in the UK are White working-class boys. (Yes I know that doesn't accord with the shibboleths of either Left or Right, but facts are facts).
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