Well, I mean, everything is relative but lets compare to western Europe.
As I understand it, unions have little to no power in the U.S in comparison to Europe. Bosses can basically sack you on the spot, with no financial aid in your search of a new job (actually, how does that work outside of work? Here in Sweden, you get paid 80% of your salary (at least with some unions) for 1 year, which is meant to help you until you find something else), and they don't need much more of a reason than "I don't like you" to fire you. Vacation days are also extremely low in comparison, and I think I read that you need to take vacation days if you're sick.
This sounds insane as a European, where we traditionally have had strong workers' rights for quite some time now.
For instance, here in Sweden a boss can't simply fire you because he wants to. You either have to fuck up monumentally so that the business is heavily damaged, or your company has to run out of stuff for you to do (and the union will find out if the boss/company is bullshitting about that, so they can't lie about it). We also get 25 vacation days, and you still get paid 80% when you're sick.
We are so close culturally, but when it comes to workers' rights it's like night and day, why?