Terrorism Prevention 215 Religious aspects 80 History 77 Government policy 74 Islam 70 Terrorists 50 September 11 Terrorist Attacks, 2001 47 War on terrorism, 2001- 43 United States 37 Foreign relations 33 Jihad 31 National security 30 Islamic fundamentalism 26 World politics 26 Political violence 24 Politics and government 24 Psychological aspects 23 Qaida (Organization) 23 Case studies 14 Congresses 14 International cooperation 14 Islam and politics 14 Psychology 14 Juvenile literature 13 Biography 12 Violence 12 Weapons of mass destruction 12 Intelligence service 11 Democracy 10