Re: And here, it should be American only . . .
It is astonishing and delightful how much of "American English" is comprised of words from foreign languages. Thank God there are no regulations on "official" or "forbidden" words from the government, like there is in France. The language continues to evolve, in an enthusiastic free-market style, with dictionaries patiently bringing up the rear. ("D'oh!" is now in the dictionary.)
Just as one tiny example, almost the entire vocabulary of the cowboy, a pure symbol of America if anything is, is based on Spanish.