It may seem unfair, but an employer can fire an “at-will” employee at any time, without good cause – or even without any cause at all. It is a bitter pill, and one that many American workers must swallow. Under the law, you are generally deemed to be employed at-will, unless you can prove otherwise.
Workers who are employed at-will can be fired for no reason, but they cannot be fired for a bad reason. Some reasons are illegal under federal or state law, exceptions to the general doctrine of at-will employment.