[saltminer]

There's also another factor at play: in many states, the power of unions is quite weak. E.g. public-sector employees in NC cannot collectively bargain, which is why they're able to get away with paying teachers horrendous wages. Want to strike? Go on ahead, pay your sub for the day (or your contract will not be renewed) and go down to Raleigh, where the legislature will recess and most of them will literally just go home and ignore all the people with picket signs.

It's a lot harder to get behind unions when they can't really be very strong.