Not even Italian and Dutch are absolutely ASCII. Italian makes use of accented vowels quite a lot (e.g. á) and Dutch technically needs the trema (e.g. tetraëder); the IJ (http://en.wikipedia.org/wiki/%C4%B2) is usually written as two letters when using computers, but typewriters still have this as its own ligature.
So, unless I'm missing something, English is the only pure ASCII language there is (except Latin, of course).
You think English is a "pure ASCII" language?? Nonsense!
What about 'façade' or 'rôle', or 'résumé', all perfectly good English words!
~fran# Francis Tyers