IQ is highly impacted by schooling and wealth. The 1965 immigration reform act filters immigrants based on skills and wealth, increasing the average IQ of immigrants. 60% of Asian-Americans are first-generation immigrants, and the total population has increased from ~1.5M in 1965 to 17M in 2010.

[0] https://en.wikipedia.org/wiki/Asian_immigration_to_the_Unite...

[1] https://en.wikipedia.org/wiki/Demographics_of_Asian_American...