Well...duh.
But because Netflix makes or gets the rights to content from countries around the world, they can incorporate it into as you say "American Netflix". Anyone arguing that Netflix doesn't have huge tentpoles is ignoring programming that wasn't made with Americans in mind. For example, the Spanish hit series, Money Heist.
There's a lot of great international programming that's overlooked on your specifically American Netflix, content we don't get if Netflix soley catered to American sensibilities...which is what I said.