Here are some doomsday scenarios and what needs to be done to survive:
Hyperinflation: U.S. is not at risk but you should still learn how to weld. Welding is good.
Global Pandemic: Possible, but an alternate location is needed to isolate yourself. So get a bunker stat.
Worldwide economic collapse: Maybe it could happen, just stay away from this guy.
Nuclear Fallout: You'll be O.K. except if you live in Ontario, Canada.
Polar Shift: Geographically impossible, but sure, yeah, prep away.
New Madrid Zone Earthquake (fault zone in the midwest): It has happened before, it's one of those "Black Swan" events, so it could happen tomorrow. I'd start prepping yesterday.
Note: building a thousand spider holes might not help you during armageddon.
channel.nationalgeographic.com
National Geographic's Doomsday Preppers