Islam Radicalism -- 2 Christianity and other religions -- 1 Foreign relations -- 1 Imperialism 1 Influence 1 Military policy 1 more ... National characteristics, American 1 Political messianism -- 1 Prevention 1 Psychological aspects. -- 1 Religious aspects -- 1 September 11 Terrorist Attacks, 2001 -- 1 Terrorism -- 1 War on Terrorism, 2001-2009 1 less ...