cofty - I remember listening to an historian back in '89 immediately after the astonishing collapse of Communism. He was asked what the future of global politics would look like now that the Cold War was over.
He replied that the world would now return to the age-old conflict between Islam and the West. I wondered what the hell he was talking about.
I wish I could remember who he was.
My quick Google search resulted in a name Samuel P. Huntington, a political scientist, who in 1992 proposed a hypothesis called the Clash of Civilizations. Later, in 1996, he wrote a book called The Clash of Civilizations and the Remaking of World Order. However, to my knowledge, he was not a historian, so I don't think this is the guy you are talking about. I wish I could go back to my World Issues class (just for a second though!) during which we discussed it...