The Clash of Civilizations is a theory, proposed by political scientist Samuel P. Huntington, that people's cultural and religious identities will be the primary source of conflict in the post-Cold War world. The theory was originally formulated in 1993 in a Foreign Affairs article titled "The Clash of Civilizations?",as a reaction 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. The term itself was first used by Bernard Lewis in an article in the September 1990 issue of The Atlantic Monthly titled The Roots of Muslim Rage
Mohammad Khatami introduced the idea of Dialogue Among Civilizations as a response to the theory of Clash of Civilizations. The term "Dialogue among Civilizations" became famous after the United Nations adopted a resolution to name the year 2001 as the year of Dialogue among Civilizations.
Additionally, the theory of Clash of Civilizations has attracted many criticisms, as explained below.
http://en.wikipedia.org/wiki/Clash_of_Civilizations