American English? With all due respect to you Sir, I think you are unfortunately mistaken. No such language exists separately from the English language spoken in England or anywhere else in the English speaking World.

Languages obviously consist of far more than just vocabulary. Grammar, syntax, punctuation, idiom are part and parcel of this all.

What does exist is an alternative US dictionary containing American spellings of English words.

This problem appears to be a linguistic misconception/fallacy perpetuated and compounded by peoples' use of word-processing applications like MS Word which always refer to 'American English'.