Government policy -- Terrorism -- 41 Foreign relations -- 20 Prevention -- 15 National security -- 10 War on Terrorism, 2001-2009 9 Politics and government -- 8 more ... Prevention. -- 7 War on terrorism, 2001- 6 Government policy 5 History -- 5 Nuclear weapons -- 5 September 11 Terrorist Attacks, 2001 5 Terrorism 5 Case studies 3 Democracy -- 3 Evaluation. -- 3 Human rights -- 3 Intelligence service -- 3 Jihad 3 Military policy 3 Nuclear arms control -- 3 Security measures -- 3 Aeronautics, Commercial -- 2 Case studies -- 2 Civil rights -- 2 Computer networks -- 2 Computer security -- 2 Economic aspects -- 2 Economic sanctions, American 2 less ...