You've got it the wrong way round, Babowa.
British English is English. American English is a bastardized version. I don't mean to sound unkind but English is English.
LOL. 😁 of course I understand your position, but we shall agree to disagree - this is from a non-native (English) speaker. This (American) English is what I was taught in a top notch school (Gymnasium) in Germany (we also had to learn Shakespearian English) - why, I do not know . So, having learned American English in school and then encountering British English later, there were and still are two distinctly different versions of English to me.
And of course, you are essentially correct, but I still disagree (in jest)........ 😁