Is there anything I can do legally giving the situation below? Thank you in advance!

Question

The owner gave me a conditional offer which I accepted, where the salary would increase after training period, the conditional terms were met during my performance review (which was excellent). At that time the owner stated they would not be honoring the initial agreement and another agreement was imposed. When I refused to accept the new agreement, I was met with hostility and then fired. Also, the owner did have the money to hire someone else new that started the same week I was fired.    
Furthermore, since the beginning of my employment, the owner kept stating to me specifically that someone else had burned them in the past and that is why they only stuck to company policy, during my time there they kept asking questions as if I were the person that had burned them in the past (I was the only Hispanic in the office). I was not sure where this kept coming from as I did not think I gave any reason to be suspicious of my work ethic. Day after day, I would come in early and leave late

Rhiannon Herbert · Answer

This situation sounds unfair, but the only way your termination could be unlawful is if you were targeted for termination based on your race (or other protected trait like sex, disability, age, or religion). Offer letters are not contracts, and an employer's failure to give you a promised pay raise is not unlawful in and of itself (assuming you made at least $684.00 per week as a salaried employee, the minimum required salary basis under federal law, throughout your employment).

Q: Is there anything I can do legally giving the situation below? Thank you in advance!