As far as North Dakotas economic success a lot of it is deceptive. They have a very low population and an industry they got lucky on and hit it big with. (An industry I should add that's not sustainable far into the future.) That's not some economic genius on their part it's due to being lucky and falling ass backwards into something and having a place were people don't want to live.
They are also stingy with social benefits. A lot of people would point to that as a sign that they have it right, but then again hardly anybody lives there and all they did with that was make people that would live there be somewhere else. Their model isn't sustainable, practical, or even fair anywhere else or even there. So, in essence, they have the luxury of making what would potentially and probably be their problem other people's problem instead. That's not doing good, that shifting bad things onto other people that's not themselves. That's something other states can't get away with, and isn't and indication that they are doing something better than everybody else.
Plus being cold and a miserable place to live for most people also helps to keep their population down. Plus this is hearsay and I'm just going with I've heard others say, and it's might be unfairly stereotyping, but I've herd a lot of places there really don't like outsiders.
If for some reason a couple million unemployed people just up and decided to move to North Dakota because they thought it was a great place to live or they have economic prosperity there, North Dakota would have an enormous unemployment percentage, the state and the people living in it would be just as bad off if not even worse than everybody else, and the state would look like crap.
From what I understand getting housing in North Dakota is EXTREMELY difficult, and it's hard to move there.