The NBC sci-fi series Revolution is set fifteen years after a world-wide blackout which rendered all things electrical useless. This quickly led to the fall of the government and civilization as a whole, resulting in a reversion to the feudal system.
This map (click on it for a bigger version) shows what the new America looks like. So far, the series has been set entirely within the Monroe Republic, ruled by a former soldier-turned-warlord named Monroe. Texas, along with Canada appear to have remained untouched (save British Columbia which was partially swallowed by California). The biggest mystery is the area marked ‘Wasteland.’ What could possibly be going on in there to keep the surrounding powers from moving in?