Not to mention that, from all I've seen and heard, European poor is also quite better off than US poor.
US poor means poor && deemed as a personal and moral failure && left socially unsupported && looked down upon in a class-aware way that's even worse than UK's traditional classism && getting into much more dangerous situations with much more crazies around, some of which will even be armed.
And as US poor, you also remain the one segment of society people can freely joke around and look down upon. They might pretend to support blacks, gays etc. in the asbstract, but could not care less if those are also dirt poor. As for the white poor, they don't even have the redeeming token minority status qualities so are open season for everybody - you could call them "white trash" with impunity.