Alexis wrote:
> Out of interest, what's the natural language other than English that can use
> ASCII only?

English isn’t one of the two ASCII-only languages.  It's naïve to think that 
even American English is ASCII-only.

I was once told that the other ASCII-only natural language is Hawaiʻian.  Pretty 
funny, huh?

Anyway, two reasonable answers to the original question would be roman Swahili 
and modern Latin.  Classical Latin needs some non-ASCII characters; see, for 
example:

https://commons.wikimedia.org/wiki/File:I_littera_in_manuscripto.jpg

which I'm attaching for convenience.