Terrorism -- 114 Terrorism 63 Prevention 22 War on terrorism, 2001- 18 Foreign relations -- 16 Islam 12 Religious aspects -- 12 more ... Prevention -- 11 History -- 10 National security -- 10 September 11 Terrorist Attacks, 2001 8 Government policy -- 7 International relations 7 Security, International 7 Military policy 6 Terrorists -- 6 World politics -- 6 Congresses 5 Foreign relations 5 Islamic fundamentalism -- 5 Political aspects 5 Case studies 4 International cooperation 4 International offenses 4 Jihad 4 United States 4 Al Qaeda 3 Child terrorists 3 Democracy 3 Globalization -- 3 less ...