The Bible is not written in American because 'American' is not a language.

The books of the Bible were originally written in several languages - Hebrew & Chaldean for the Old Testament and Greek for the New Testament. They were originally written as separate letters and were later canonized (or compiled into a book) by the Church many years after Christ's death.

This canonized form is what we now know as today's Bible and has been translated into almost every language in the world.

BTW, there is no 'official' Hebrew bible because as you should know, the Jews don't recognize Jesus as the their Messiah and to this day believe they are still waiting for him. The only official Jewish manuscripts are the Torah (the first five books of the OT), and the Septuagint, which is basically the Old Testament.