Do you always get the unpleasant tasks at work even though your coworker, who just started, has already been promoted? Does it feel like you're always put on solo jobs in the back room while your co-workers are doing work elsewhere? Do you suspect it's because of your race? If something doesn't smell right, it may be illegal.
What is discrimination?
Thanks to the 1964 Civil Rights Act, discrimination against an employee based on race, religion, ethnicity, sex and color of skin is illegal. Discrimination isn't restricted to being hired or fired based on one of those protected classes, though.