An employer cannot discriminate based on race or national origin. If you have been fired, demoted, or harassed because of this type of discrimination then you have a few options:
You can file a complaint with the Office of the Attorney General
You can file a complaint with the Equal Employment Opportunity Commission
You can file a complaint with the New York State Division of Human Rights
You can file a complaint with the NYC Commission on Human Rights (if you are a NYC employee)