American roulette is a version of roulette that was originally developed for the US market. Taking the original European format and adding an extra number, American roulette is regarded as a more volatile and, in some people’s opinion, a more entertaining variant. Put simply, when you look at American roulette vs. European roulette, they’re virtually identical except the former has an additional number (i.e. it has 38 numbers instead of 37).