Terrorism -- Government policy -- 18 Prevention -- 15 Foreign relations -- 12 History -- 8 War on terrorism, 2001- 7 National security -- 6 more ... September 11 Terrorist Attacks, 2001 4 Civil rights -- 3 Jihad 3 Politics and government -- 3 Terrorism 3 Terrorists -- 3 Case studies 2 Civil defense -- 2 Defenses 2 Influence 2 Insurgency -- 2 Islam 2 Islamic fundamentalism -- 2 Military policy 2 Political aspects 2 Political aspects -- 2 Politics and government 2 Prevention 2 Prevention. -- 2 Psychological aspects 2 Religious aspects -- 2 September 11 Terrorist Attacks, 2001 -- 2 Asymmetric warfare -- 1 less ...