Terrorism -- 68 Terrorism 38 Prevention -- 21 Foreign relations -- 20 War on terrorism, 2001- 18 Prevention 16 National security -- 13 more ... Government policy -- 12 World politics -- 10 History -- 9 Islam 7 Religious aspects -- 7 International cooperation 6 Case studies 5 Military policy 5 Political aspects 5 Civil rights -- 4 Globalization 4 International relations 4 Political violence 4 Security, International 4 September 11 Terrorist Attacks, 2001 4 Weapons of mass destruction 4 Defenses 3 Foreign relations 3 Government policy 3 Imperialism 3 Islamic fundamentalism -- 3 Political aspects -- 3 Politics and government -- 3 less ...