A non-unionised employee in a state with "at will" employment has no protection whatsoever from losing his job, unless he or she is part of a protected class, such as Black, female, or homosexual, and has enough $$$ to get an attorney to to take the case.
Under absolutely no circumstances (at least none that I've heard of) does an employee have even a ghost of a chance of suing if his entire function or department has been shut down.
I have reason to know this. After ten years as "management" in the same company, I was morally compelled to resign because I was threatened with reprisals if I refused to participate in an unethical scheme to defraud the union.
But here's the fun part, which most people don't know: if you are fired for refusing to do something unethical or illegal you have no recourse except in rare instances covered by specific laws.
For example, you work as a cashier and your boss tells you to short change the customers. You refuse and he fires you. Tough luck, Charlie. Maybe you shouldn't have been paying so much attention at church when you were a kid. But, no problem for the employer -- he'll just keep cycling through the labour pool until he finds someone willing to lie, cheat, and steal for him.
And, under such circumstances, don't expect to collect unemployment either, because unless you have amassed whole file cabinets of corroborating documentation, the state D-o-L is going to believe the employer rather than the ex-employee.
The idea of the pampered American worker is a myth used to justify the economic treason of American business.
Wages can only go up in one of two ways. A labor shortage which happens when population growth stabilizes somewhat and employers are competing for workers. The other way is when the government creates labor abundance through uncontrolled immigration or outsourcing and that is with unions. Right now countries like China which are Communist have a tight rope on their labor so labor will stay very cheap there but that could destabilize.