Do you think the disaster was truly worldwide, or might it have been confined to just the one continent? Why? What evidence is there that everything has been destroyed?
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I don't think that the extent of global devastation was McCarthy’s reason for writing this book. The themes are very centered around the relationship between the boy and the man. Judging for the complete and utter devastation of everything living, I would expect this apocalypse to be worldwide.
The disaster was worldwide because people wouldn’t have stayed where they were if there was a better place for them to go.