Radicalism -- Terrorism -- 3 Islam 2 Christianity and other religions -- 1 Criminology 1 Foreign relations 1 Foreign relations -- 1 more ... History. -- 1 Imperialism 1 Influence 1 Islamic fundamentalism -- 1 Jihad 1 Military policy 1 National characteristics, American 1 Political messianism -- 1 Political violence -- 1 Politics and government 1 Prevention 1 Psychological aspects. -- 1 Race relations 1 Radicalism 1 Religious aspects -- 1 Right and left (Political science) 1 September 11 Terrorist Attacks, 2001 -- 1 Social movements -- 1 Terrorism 1 War on Terrorism, 2001-2009 1 less ...