> … for any reason.

If they give a reason, it had better be a legal reason. “Because you’re Mexican” - not legal. “Because we don’t like you/you don’t fit in” - are you in any way different than management? Differently gendered? Differently skin toned? Different faith? Pregnant? Likely not legal.

They are not required to give a reason. You can be fired without reason.

There’s also mitigating circumstances. If the employee can show retaliation by the employer (say the employee participates in protected activities, like espousing unionization or questioning managerial decisions), they stand a chance of recovering damages from the company.