If your hours were cut and non-minorities hired to replace you, that would typically raise an inference of discrimination based on race/national origin.
Your recourse would typically involve filing a complaint with the HR department alleging discrimination in an attempt to resolve the matter through the employer. If it is not resolved promptly and your hours restored, then you should normally file a complaint with the EEOC.
They can also provide you with attorney referrals. Look for ones who take contingency fee cases to represent you.
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