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Actually it is an English word first used in the 4th Century and used by writers, poets and playwrights throughout English history since. The Victorians changed that though, calling it an "Americanism".
Another thing the Victorians did (when attempting to standardise our language) was drop the use of 'z' in some words such as in "organize" or "appetizer". Before then and for many centuries before that, we used 'z' in place of 's' and it was only around the turn of the 20th Century that current spellings in the United Kingdom became common. In short, the use of the 'z' has nothing to do with America -- they are merely using the spellings we took over there in the early days of colonisation (or colonization).
--non-DIY post over--