Terrorism -- Prevention -- 23 Prevention 19 Government policy -- 17 Religious aspects -- 15 Foreign relations -- 14 Islam 14 more ... Terrorism 14 History -- 13 National security -- 11 War on terrorism, 2001- 9 Politics and government -- 7 International cooperation 6 Jihad 5 Political aspects 5 Case studies 4 Islam and politics -- 4 Military policy 4 September 11 Terrorist Attacks, 2001 4 Terrorists -- 4 Civil rights -- 3 Encyclopedias 3 Foreign relations 3 Islamic fundamentalism -- 3 Psychological aspects 3 Psychology 3 Radicalism -- 3 Weapons of mass destruction 3 World politics -- 3 Biography -- 2 less ...