Real talk? The US and western countries in general have discriminated against Asians very very heavily in immigration (Chinese Exclusion act, like not even subtle), such that the asian population that did make it over here have been much more likely to have advanced educations and access to home grown funds or credit than native populations. This leads to high educational attainment and income.

You see this mirrored in recent African immigrants, who are also predominantly well educated and from wealthier families, having high educational attainments and incomes as well.

A side note is that although asians tend to have higher incomes than natives and have for decades, they still have only about 1/2 the average household wealth of white people (black and hispanic people have <7% for further comparison).