This could be along the line of Man Made Global Warming but if somehow Yellowstone's massive Super Volcano was to blow you don't have to worry about tax cuts or the United State's economy for their won't be any nor will there be much of the United States left. Forget Global Warming whether man-made or not for most of the world and surely the United States would see winter weather for a very long time and rely on many other Nations for survival.
This could be looked at as Chicken Little type fear mongering but there is, according to science, a super volcano under there and there are seismic activities going on that gives some Scientist worry or at the least concern that something may be brewing. Other's believe they might prevent it by pumping tons of cooling water underground in an attempt to calm/cool things down. Either way, the what if's are worth considering just as they are for a meteor or asteroid strike given the enormous damage if not catastrophic damage that would follow.
Still, some others believe that a Yellowstone type super-eruption is something that is prophesied by omission, in Scriptures given that the United States is glaringly absent from End Times prophecy thus something unthinkable or catastrophic has to have happened to render the United States void on the world stage or with respect to End Times events. Myself I just find it interesting that we have a lot of people that spend a lot of time contemplating things they really have little possibility of affecting if it happens. Anything on that scale will mean the lucky/fortunate ones will be taken immediately leaving the rest to cope with what would naturally follow. World Wide Turmoil.