Kampf der Kulturen
The theory was originally formulated in a 1992 lecture at the American Enterprise Institute, which was then developed in a 1993 "Foreign Affairs" article titled "The Clash of Civilizations?", in response to Francis Fukuyama's 1992 book, "The End of History and the Last Man". Huntington later expanded his thesis in a 1996 book "The Clash of Civilizations and the Remaking of World Order".