I would never say that it's "impossible" for the U.S. to end up like Bosnia, but is rather unlikely, and I don't see many indicators for such a scenario within our lifetime.

Knowing a bit about human nature, however, I'm aware that we all have a perverse hidden desire to see the world end, which is why doomsday predictions occur so often in religious myths, why doomsday movies are so profitable, and why some people wish to convince you that it'll happen tomorrow, and even try to hurry it along.

And while I agree that basic "survival" skills are valuable, and that you should keep some supplies in case of an emergency, the majority of our energy should be spent working better as a group, towards a more effective society that is itself more resilient against disasters, natural or artificial.