Hmong American immigrants first came to the United States as refugees of the Vietnam War. Forty years on, they have made a notable impact in American political life. They have voter participation rates higher than most other Asian American ethnic groups, and they have won seats in local and state legislative bodies. Yet the average level of education among Hmong Americans still lags behind that of the general U.S. population and high rates of poverty persist in their community, highlighting a curious disparity across the typical benchmarks of immigrant incorporation.

Carolyn Wong...