Terrorism -- Prevention 22 Terrorism 19 Religious aspects -- 12 Islam 11 Prevention -- 11 National security -- 10 more ... Government policy -- 7 War on terrorism, 2001- 7 Foreign relations -- 6 History -- 6 September 11 Terrorist Attacks, 2001 6 Terrorists -- 6 Congresses 5 Foreign relations 5 Case studies 4 International cooperation 4 Islamic fundamentalism -- 4 Jihad 4 United States 4 Child terrorists 3 Democracy 3 History 3 International offenses 3 International relations 3 Islam and politics -- 3 Military policy 3 Political aspects 3 Politics and government 3 Civil defense -- 2 less ...