Terrorism -- 70 Prevention. -- 29 Foreign relations -- 28 War on Terrorism, 2001-2009 22 National security -- 18 Government policy -- 16 Politics and government -- 14 more ... September 11 Terrorist Attacks, 2001 11 Islam 10 Prevention -- 9 Religious aspects -- 9 Prevention 8 Civil defense -- 7 History -- 7 Intelligence service -- 7 Islamic fundamentalism 7 Military policy 7 Jihad 6 Terrorism 6 Terrorists -- 6 Armed Forces -- 5 Defenses 5 Islam and politics -- 5 Muslims -- 5 Relations -- 5 Security measures 5 September 11 Terrorist Attacks, 2001 -- 5 Civil rights -- 4 Emergency management -- 4 Islamic fundamentalism -- 4 less ...