Radicalism -- 3 Christianity and other religions -- 1 Criminology 1 Foreign relations -- 1 History. -- 1 Imperialism 1 Influence 1 more ... Islam 1 Military policy 1 National characteristics, American 1 Political messianism -- 1 Psychological aspects. -- 1 Radicalism 1 Right and left (Political science) 1 September 11 Terrorist Attacks, 2001 -- 1 Social movements -- 1 Terrorism 1 Terrorism -- 1 War on Terrorism, 2001-2009 1 less ...