Terrorism -- Foreign relations -- 8 Politics and government -- 7 Prevention. -- 6 Government policy -- 5 National security -- 4 War on Terrorism, 2001-2009 4 more ... Foreign relations 2 History -- 2 Intelligence service -- 2 Politics and government 2 Prevention 2 Prevention -- 2 Security measures 2 Terrorism 2 Air power -- 1 Case studies 1 Causes 1 Church and state -- 1 Citizen participation. -- 1 Civil defense 1 Civil defense -- 1 Civil rights -- 1 Cold War 1 Combatants and noncombatants (International Law) 1 Defenses 1 Democracy -- 1 Detention of persons -- 1 Drug traffic -- 1 Economic sanctions, American 1 less ...