| It is not clear whether it was a world war, or a terrorist attack, or something else more sinister. As far as we know from the story told so far, the mushroom clouds all hit within vicinities of the main military bases and training facilities, and or the communication hubs. The people in Jericho are unable to contact other towns and cities, probably due to the radiation. We are led to believe that there are other survivors in other places in the country, one of the story arcs for the rest of the series is for Jericho to make contact with the other stranded or isolated people.
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