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I'm a Northern Girl
Then I wouldn't take her evaluation as gospel. It's difficult for someone working for one company to effectively determine the job positions and pay rates of another company since every employer has subtleties about them that are not evident to someone outside.
However, if you believe that the sole reason you are not being promoted is your race, your first step is to talk to your own HR.
However, if you believe that the sole reason you are not being promoted is your race, your first step is to talk to your own HR.