Gotta agree with kenny here. We don't know for sure what caused the destruction -- just that something did several years earlier. It could be manmade, it could be natural (though admittedly there are only a few natural events that could cause destruction this widespread). It's simply not known, and I'm sure McCarthy left it that way intentionally.
On another note, for anyone who plays games (I can only squeeze in one or two a year these days), The Road was apparently required reading for the designers of Fallout 3. The descriptions of the landscapes, towns, and survivors are a near-perfect match to those in the game (minus the 50s Americana theme of the game).
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