September 11 Terrorist Attacks, 2001 -- Influence 15 Terrorism -- 8 Causes 6 Foreign relations -- 5 History -- 4 Islam -- 4 more ... Islam and politics -- 4 Islam 3 Political aspects 3 Politics and government -- 3 Religious aspects -- 3 Cold War 2 East and West 2 Government policy -- 2 Islam and state -- 2 Muslims -- 2 National characteristics, American 2 Political aspects -- 2 Psychological aspects 2 Psychological aspects. -- 2 Terrorism 2 War on Terrorism, 2001-2009 2 Anti-Americanism 1 Christianity and other religions -- 1 Cold War -- 1 Congresses 1 Congresses. -- 1 Developing countries 1 Diplomatic history 1 less ...