Terrorism -- 25 History -- 17 Terrorism 14 Foreign relations -- 10 Prevention 10 Politics and government -- 9 Security, International 8 more ... World politics -- 8 Politics and government 7 Prevention -- 7 Foreign relations 5 International relations 5 Religious aspects -- 5 Globalization 4 History 4 Islam -- 4 Islam and politics -- 4 National security -- 4 Terrorists -- 4 International cooperation 3 Islam 3 Military policy 3 Psychological aspects 3 Psychology 3 Religious aspects 3 War on terrorism, 2001- 3 Biography -- 2 Case studies 2 Congresses 2 Congresses -- 2 less ...