Terrorism -- Prevention 31 Prevention -- 27 Terrorism 27 Government policy -- 15 Foreign relations -- 13 History -- 13 more ... National security -- 12 Islam 11 Religious aspects -- 11 Terrorists -- 10 War on terrorism, 2001- 10 Psychological aspects 9 International cooperation 6 Psychology 6 Radicalism -- 5 Case studies 4 Congresses -- 4 Government publications -- 4 History 4 International relations 4 September 11 Terrorist Attacks, 2001 4 World politics -- 4 Civil rights -- 3 Congresses 3 Forecasting 3 Foreign relations 3 Government policy 3 Islam and politics -- 3 Islamic fundamentalism -- 3 less ...