The NY Times has an opinion article (What Drives Success?) that discusses why some minorities succeed and others not. It is a preview of a forthcoming book by Amy Chua and Jed Rubenfeld (“The Triple Package: How Three Unlikely Traits Explain the Rise and Fall of Cultural Groups in America.”).
Indian-Americans earn almost double the national figure (roughly $90,000 per year in median household income versus $50,000). Iranian-, Lebanese- and Chinese-Americans are also top-earners. In the last 30 years, Mormons have become leaders of corporate America, holding top positions in many of America’s most recognizable companies.  Jewish success is the most historically fraught and the most broad-based. Although Jews make up only about 2 percent of the United States’ adult population, they account for a third of the current Supreme Court; over two-thirds of Tony Award-winning lyricists and composers; and about a third of American Nobel laureates.
There are some black and Hispanic groups in America that far outperform some white and Asian groups. Immigrants from many West Indian and African countries, such as Jamaica, Ghana, and Haiti, are climbing America’s higher education ladder, but perhaps the most prominent are Nigerians. Nigerians make up less than 1 percent of the black population in the United States, yet in 2013 nearly one-quarter of the black students at Harvard Business School were of Nigerian ancestry; over a fourth of Nigerian-Americans have a graduate or professional degree, as compared with only about 11 percent of whites.
Cuban-Americans in Miami rose in one generation from widespread penury to relative affluence. By 1990, United States-born Cuban children — whose parents had arrived as exiles, many with practically nothing — were twice as likely as non-Hispanic whites to earn over $50,000 a year. All three Hispanic United States senators are Cuban-Americans.
Meanwhile, some Asian-American groups — Cambodian- and Hmong-Americans, for example — are among the poorest in the country, as are some predominantly white communities in central Appalachia.
According to the authors these advantages are not constant:
The fortunes of WASP elites have been declining for decades. In 1960, second-generation Greek-Americans reportedly had the second-highest income of any census-tracked group. Group success in America often tends to dissipate after two generations. Thus while Asian-American kids overall had SAT scores 143 points above average in 2012 — including a 63-point edge over whites — a 2005 study of over 20,000 adolescents found that third-generation Asian-American students performed no better academically than white students
The authors mention three factors that drive success:
- a superiority complex — a deep-seated belief in their exceptionality
- insecurity, a feeling that you or what you’ve done is not good enough
- impulse control