While the first "Judge Dredd" story is set in "New York 2099AD", prog 3 retconned that and said New York was just part of Mega-City One. The back of prog 3 included an Ezquerra "Futuregraph" poster of Mega-City One (a page from an unused "Dredd" story), which said the city stretched from Montreal to Georgia and had 150 million citizens; it was part of the "United States of the West" (USW). Prog 4 then established that Mega-City One was surrounded by wildernesses from the Atomic Wars. The 150 million population was later revised to 100 million in earlier strips and abruptly bumped to 800 million later on. The United States of the West concept was dropped entirely; a "United Cities of North America" of three megacities was mentioned in prog 42 and then itself dropped in favour of Mega-City One being an independent entity.