Terrorism 1,533 Prevention 649 War on Terrorism, 2001-2009 342 History 262 Politics and government 202 Government policy 198 Religious aspects 168 National security 164 Foreign relations 140 Islam 140 September 11 Terrorist Attacks, 2001 121 Law and legislation 108 Political aspects 100 Terrorists 94 Social aspects 93 Islamic fundamentalism 83 Jihad 73 Psychological aspects 70 State-sponsored terrorism 69 Political violence 67 Security measures 65 Intelligence service 55 Military policy 53 Civil rights 52 Security, International 51 Human rights 50 Iraq War, 2003-2011 50 Violence 50 International cooperation 48 Influence 46