Legally speaking it doesn't matter whether the wages are "fair" because the law actually does not require employers to be fair in determining how much they pay their employees. What the law prohibits is discrimination on the basis of legally protected traits, such as race, religion or gender. What this means is that any pay disparity that is MOTIVATED by a protected trait (i.r. race) would be legally actionable.
Here, the facts you describe suggest that your employer may be motivated by race in paying certain employees less. THAT is illegal, not simply the fact that it is "unfair."
The remedy for an employee being paid less because of race is to file a complaint with the EEOC. The EEOC will investigate and attempt to mediate a resolution with your employer. That not forthcoming, they will either file a lawsuit on your behalf or issue you a "right to sue" letter, which will enable you to sue in civil court with the assistance of an attorney.
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