A global disaster is very different from a local one. I suggest you review your faith in The Almighty We. Civilization has never been more fragile in history than it is now.
In fact, if the "once country" was _China_ (or Taiwan) it could be a civilisation ending event. We've built a house of cards, and while it does have some redundancy it's not all that resilient.
Keep in mind the modern world as it is now hasn't even existed 50 years, it has never really been tested with a truly international disaster.
Let’s see how we handle something real like another world war or global natural disaster.