Median US Household Income for Various Ethnic Groups

Culture, the content of your character and work ethic more important and skin colour. 

Via NYT:

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.