Terrorism -- 212 Prevention 119 Prevention -- 76 Terrorism 50 National security -- 35 Prevention. -- 34 Government policy -- 25 more ... Terrorists -- 16 Government policy 15 International cooperation 13 War on Terrorism, 2001-2009 13 Psychological aspects 11 Security measures 11 Foreign relations -- 10 Islam 10 Religious aspects -- 10 War on terrorism, 2001- 10 Civil defense -- 8 Foreign relations 7 Politics and government -- 7 Psychology 7 Congresses -- 6 Emergency management -- 6 Military policy 6 Security measures -- 6 Security, International 6 Civil rights -- 5 Congresses 5 Government publications -- 5 September 11 Terrorist Attacks, 2001 5 less ...