[IowaStatePhiPsi]

if you look at historically...
white women have not had as much need to work as minority women. Plus you need to look at what the career percentages are.
The majority of white women I know are at Iowa State for things like sociology, Human nutrition, HRI, education.
The majority of minority women I know are at Iowa State for things like engineering, veterinary medicine, pre-med, pre-law etc.
Not sure if that's just anecdotal or if it mirrors any real trend, but that would provide for a wage gap if it was a real trend.