In Total Recall (2012), most of the world was rendered uninhabitable. Two regions remain habitable, the UK and Australia. So you'd expect accents appropriate to those areas to be common. However, in the film, almost everyone has American accents. I would normally brush this off as a result of it being a Hollywood film, but one of the exceptions hints there may be more to this.
When Lori (Kate Beckinsale's character) reveals herself to be an undercover cop, she switches from having an American accent to having an English accent. The English accent then persists through the end of the film. This implies that to be a convincing wife to Douglas, she needed to have an American accent, so there's some in-universe importance of accents.
So my question is, why were American accents so common, instead of UK and Australian accents?