Terrorism -- Foreign relations -- 16 Government policy -- 10 Politics and government -- 10 War on Terrorism, 2001-2009 8 Prevention. -- 6 National security -- 5 more ... September 11 Terrorist Attacks, 2001 4 History -- 3 Prevention 3 Prevention -- 3 World politics -- 3 Civil rights -- 2 Foreign relations 2 Intelligence service -- 2 Islamic fundamentalism 2 Politics and government 2 Press coverage -- 2 Security measures 2 Terrorism 2 War -- 2 Air power -- 1 Case studies 1 Causes 1 Church and state -- 1 Citizen participation. -- 1 Civil defense 1 Civil defense -- 1 Cold War 1 Combatants and noncombatants (International Law) 1 less ...