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<p>If the population of Asian people happens to be predominantly the first US-born (i.e. English speaking, reading, and writing) generation children of immigrants who came here on student or skilled worker visas and therefore disproportionately have advanced degrees, should it really be that surprising to find high levels of educational achievement in that population?</p>
<p>It likely takes a few generations for the descendents of an immigrant group filtered by immigration selection (e.g. for graduate students and skilled workers) to assimilate into the educational achievement mediocrity typical in the US.</p>