> AI for Europe was Prolog and in America it was LISP,
I wouldn't say 'main language', but Prolog maybe a little more popular in Europe. The Japanese though based their 'fifth generation' project on logic programming. I once saw a Prolog Machine, a computer with the architecture optimized for Prolog and the main software written in Prolog:
http://museum.ipsj.or.jp/en/computer/other/0009.html
$119000 a piece...