The decline in oil prices has been anywhere from tough to catastrophic for states relying on severance taxes for their budgets. Alaska has taken a brutal beating and is on the brink of bankruptcy. North Dakota has experienced one of the largest contractions in GDP any state has seen in recent memory, shrinking the tax base as well.
Wyoming is having a slightly different experience, with a lighter dependency on oil than Alaska but a coal production that at its peak made Wyoming the world's second largest coal producer. The combination of gradually tighter regulations on coal, a global drop in energy demand thanks to recessions in Europe, China and Japan, and on top of that depressed oil prices has been a death-by-a-thousand blows experience for the Cowboy State.
In all the states where severance-tax revenue has declined substantially there are political wishing wells where legislators go to find a glimmer of hope that the good old severance-tax days are going to come back. Some of them think that the recent rebound in oil prices is only the beginning.