September 11 Terrorist Attacks, 2001 -- Influence 4 Foreign relations -- 3 Terrorism -- 2 Causes 1 Christianity and other religions -- 1 Cold War 1 more ... Cold War -- 1 Diplomatic history 1 Drug traffic -- 1 Government policy -- 1 History -- 1 Imperialism 1 Islam 1 Islam and politics -- 1 Military policy 1 National characteristics, American 1 Negotiation -- 1 Persian Gulf War, 1991 1 Political aspects 1 Political aspects -- 1 Political culture -- 1 Political messianism -- 1 Politics and government -- 1 Psychological aspects. -- 1 Radicalism -- 1 Relations -- 1 Voting -- 1 War on Terrorism, 2001 -- 1 War on Terrorism, 2001- -- 1 less ...