I suspect bmw and benz put a "usa" at the end of their name for their US branches since they're German companies that probably sell more cars in Europe (total out-of-thin-air guess).
For some non-German examples, take toyota (japanese) or kia (korean) or ferrari (italy) or land rover (britain).
Also, daimler sells way more cars in europe, although they are really stripped down compared to the US equivalents (and they also have stuff like sprinter, which I've only started to see recently in the USA). Even though those cars are lower margin, they sell many more (and most of their revenue comes from those cars)
