Terrorism -- 72 Foreign relations -- 30 Prevention. -- 29 War on Terrorism, 2001-2009 23 National security -- 18 Government policy -- 17 Politics and government -- 14 more ... Islam 11 September 11 Terrorist Attacks, 2001 11 Prevention -- 10 Religious aspects -- 10 History -- 9 Islamic fundamentalism 8 Military policy 8 Prevention 8 Civil defense -- 7 Intelligence service -- 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 Democracy -- 4 Emergency management -- 4 less ...