Do I have a case for discrimination and wrongful termination?

As a newly hired manager, I noticed that my employees weren't working to their best potential. I began letting them know my expectations of them and held them accountable for job responsibilities, as a manager would do. They didn't like the change I was bringing,because they began sending lies to HR, iIncluding a lie of sexual harrasment. There wasn't any proof of anything. From then, my managment informed me not to talk to the employees or hold them accountable for their actions. I couldn't write them up for their poor perfomance and my manager allow them to do whatever they wanted. I was told not to do my job and I was getting written up for their poor performance that they were purposely doing. A co-worker informed me that she heard them say they wanted to get me out because I was black. There were other racial remarks made as well. I informed my managment, but there wasn't any investigation, nor HR contacted. I was terminated without any documentation b/c of "performance".