Alabama is an at-will employment state, which means one can be terminated at any time for any reason without notice. Exceptions are if it can be shown that the termination was based on discrimination against one of the protected classes or if you are working under an express or implied contract providing a right to continued employment or set procedures that must be followed in order for a termination to occur. Unless one of those exceptions applies you are SOL.
There. Fixed it. Same as in the State of Florida. Been there done that. And if you are a white male over 40 you will probably be wasting your time filing an action with the EEOC unless you can prove a violation of the ADEA, but the odds are not in your favor, as that Act primarily protects you from having been age-discriminated against by a government entity, not by a private sector employer.