Alaska aside from the oil production it has also has the fishing industry and crabbing industry all of which are high paying jobs.
what they fail to mention in that article (conveniently) is that 56k in one area of the country is like making 36k in another part of the country due to the high cost of living. Anyone try living in some of these high population areas they mention on the amount of "average income" they also mention? Probably couldn't do it and if you could you sure wouldn't be living all that well.
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"I'll keep my money, guns and freedom. You can keep the "Change."