I find it very clever actually. The novel is set in America but since there are no actual names given to the characters and places, one may very well imagine the story to happen in any place and to anybody on Earth. I think this method gives more dimension to the story, that if a kind of apocalyptic destruction that's described in The Road occurs it could/would affect not only one corner of the globe but rather the whole planet itself.
That said, there's a passage in the book that I found quite interesting. On page 204 the man finds on the ground a coin with a Spanish inscription. Has he, with his son, gone all the way south to Mexico perhaps?



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as has been pointed out though we don't know for sure that it is nuclear. and yes I also felt it was more poetry than story telling, McCarthy uses this apocalypse with a great deal of artistic licence, he doesn't directly tell us what it is so that he can get away with inventing the details to suit his purpose.
