Unless you're saying that the problem is that the US doesn't make every new auto manufacturer a UAW shop with no opt-out?
The US specifically did not want this to happen, which is why it made unionization only valid on the basis of the adversarial, shop-vote model, but grandfathering in some unions that already functioned along similar, sectoral lines, such as the Hollywood unions.
Why do those other people get some automatic raise?
Because other people are constantly told how great Europe/Scandinavia is. So these 'other people' just want to have good life by moving there.
https://en.wikipedia.org/wiki/Scandinavia#Use_of_Nordic_coun...
Then it's often interesting to point to various places in the world where in fact, the thing is possible.
As you said, oil helps, but it’s not determinative. Norway is interesting in that they’ve used their oil money very wisely, but it seems pretty clear that other policies are necessary in order to ensure that economic prosperity is well distributed.