There's a reason for Americanization.
We Brits know the rest of the world is somewhat parochial.
We know, for example, that the Germans do in fact speak English, but to maintain face, they change "v"s into "w"s and join all the words together to make one long one (oh, yes, and put the verbs at the end). That way, they can pretend it's a different language.
The French merely add the odd e to the end of some words (as in "Concorde"). But the give-away is their word for "weekend".
So the Americans don't feel comfortable when the rest of us display our Alien roots. So, just as we let the French call the plane "Concorde" and think it was theirs, we let the Americans miss the "u" out of lots of words, miss-spell "metre" and "fibre" (the French get that right), say "Howdy" instead of "Hello, Ducks" and call it "Math" without the "s"
We know they're wrong but we're too polite to mention it.