In the wake of the September 11, 2001 attacks, the interest in Lewis's work surged, especially his 1990 essay The Roots of Muslim Rage. Three of his books were published after 9/11: What Went Wrong? (written before the attacks), which explored the reasons of the Muslim world's apprehension (and sometimes outright hostility) to the modernization, and The Crisis of Islam, and Islam: The Religion and the People (published in 2009).

Coined the phrase "Clash of Civilizations"

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