Prevention -- Terrorism -- National security -- 18 Government policy -- 16 Terrorism 15 International cooperation 12 Government policy 10 more ... Prevention 10 Foreign relations -- 7 Congresses 5 Congresses -- 5 Emergency management -- 5 Civil rights -- 4 Fiction 4 History -- 4 War on terrorism, 2001- 4 Weapons of mass destruction 4 Civil defense -- 3 Law and legislation -- 3 Military policy 3 Politics and government -- 3 Terrorists -- 3 Counterinsurgency -- 2 Defenses 2 Economic sanctions, American 2 History. -- 2 Intelligence officers -- 2 International cooperation -- 2 Law and legislation 2 Politics and government 2 less ...